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clam

clam

The Columbia Encyclopedia, 6th ed. | 2008 | Copyright

clam common name for certain bivalve mollusks, especially for marine species that live buried in mud or sand and have valves (the two pieces of the shell) of equal size. The oval valves, which cover the right and left sides of the animal, are hinged together at the top by an elastic ligament. Clams burrow by means of a muscular foot, located at the front end, which can be extruded between the valves. The head, located within the shell, is rudimentary, without eyes or antennae. Water containing oxygen and food particles enters through an incurrent siphon; waste-containing water is expelled through an excurrent siphon. The two tubes project from the end opposite the foot and may be united in a single structure called the neck. The sexes are usually separate. Eggs and sperm are deposited in the water; the fertilized egg develops into a free-swimming larva without a shell, which may not attain the adult form for several months.

Clams are highly valued as food. The soft-shell clam, or steamer ( Mya arenaria ), of both coasts of North America, is one of the most popular eating clams. The hard-shell clam ( Mercenaria mercenaria ), also known as the northern quahog, is abundant from the Gulf of St. Lawrence to Texas. The name quahog is from the Naragansett; some Native Americans used the violet portion of the shell for wampum. Small hard-shell clams are called littlenecks; somewhat larger ones, cherrystones. The ocean quahog ( Artica islandica ) is among the longest-lived animals; one was estimated to be between 405 and 410 years old in 2007. The razor clam ( Ensis ), shaped like an old-fashioned straight razor, burrows rapidly and swims by means of its foot. The Atlantic razor clam, found from Labrador to W Florida and prized for its flavor, may attain lengths of 10 in. (25 cm). The Eastern surf clam ( Spisula solidissima ) frequents sandy bottoms in shallow water from Labrador to North Carolina and is much used for bait. There are also several Pacific surf clams. Other Pacific clams include the succulent Pismo clam ( Tivela stultorum ), found from mid-California southward and protected by law from overdigging, and the geoduck of the Pacific Northwest, which may weigh as much as 12 lb (5.4 kg). The valves of many small clams are familiar seashells, such as those of the pea-sized amethyst gem clam. The giant clam of the S Pacific Ocean may reach a weight of 500 lb (227 kg) and a length of 5 ft (150 cm).

There are two families of freshwater bivalves called clams. The small freshwater clams (family Sphaeriidae) are hermaphroditic; they retain the fertilized eggs in a brood pouch and bear young with shells. The large freshwater clams (family Unionidae) are also called freshwater mussels ; the nacreous inner layer of their shells is a source of mother-of-pearl. The larvae of these clams are parasitic on the gills of fish.

The term clam is sometimes used synonomously with bivalve; in this sense it includes the oysters , scallops , and marine mussels. Clams are classified in the phylum Mollusca , class Pelecypoda or bivalvia.

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"clam." The Columbia Encyclopedia, 6th ed.. 2008. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>.

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clam

The Oxford Pocket Dictionary of Current English | 2009 | Copyright

clam / klam/ • n. 1. a marine bivalve mollusk (subclass Heterodonta) with shells of equal size. ∎  inf. any of a number of edible bivalve mollusks, e.g., a scallop. 2. inf. a dollar. 3. colloq. a shy or withdrawn person. • v. (clammed , clamming ) [intr.] 1. dig for or collect clams. 2. (clam up) inf. abruptly stop talking, either for fear of revealing a secret or from shyness.

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clam

The Oxford Dictionary of Phrase and Fable | 2006 | | Copyright

clam a marine bivalve mollusc with shells of equal size, taken as the type of something which silently withdraws into itself from contact with another. The name is recorded from the early 16th century and apparently comes from earlier clam ‘a clamp’, from Old English clam, clamm ‘a bond or bondage’.
happy as a clam at high tide in North American usage, very happy.
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ELIZABETH KNOWLES. "clam." The Oxford Dictionary of Phrase and Fable. 2006. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>.

ELIZABETH KNOWLES. "clam." The Oxford Dictionary of Phrase and Fable. 2006. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O214-clam.html

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clam

World Encyclopedia | 2005 | Copyright

clam Bivalve mollusc found mainly in marine waters. It is usually partly buried in sand or mud with the two parts of the shell slightly open for feeding. With a large foot for burrowing, its soft, flat body lies between two muscles for opening and closing the shells. A fleshy part called the mantle, lies next to the shells. Clams feed on plankton. Class Pelecypoda.
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clam

The Concise Oxford Dictionary of English Etymology | 1996 | | Copyright

clam clamp XIV; bivalve shell-fish XVI (clamshell). OE. clam bond, fetter, corr. to OHG. klamma (G. dial. klamm), and MHG., G. klemme, Du. klemme, klem, f. Gmc. *klam- press or squeeze together.
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T. F. HOAD. "clam." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>.

T. F. HOAD. "clam." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O27-clam.html

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Clam

Dictionary of Collective Nouns and Group Terms | 1985 | Copyright

Clam

a stack or pile of bricks; a heap of oysters.

Examples: clam of bricks, 1663; of earth, 1554; of oysters.
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clam

Oxford Dictionary of Rhymes | 2007 | Copyright

clam •am, Amsterdam, Assam, Bram, cam, cham, cheongsam, clam, cram, dam, damn, drachm, dram, exam, femme, flam, gam, glam, gram, ham, jam, jamb, lam, lamb, mam, mesdames, Omar Khayyám, Pam, pram, pro-am, ram, Sam, scam, scram, sham, Siam, slam, Spam, swam, tam, tram, Vietnam, wham, yam •in memoriam • ad nauseam •iamb, Priam •grandam • Edam • goddam •quondam • Potsdam • cofferdam •Rotterdam • Oxfam • Birmingham •Abraham • logjam • CAD-CAM •minicam • Nicam •Eelam, Elam •flimflam • oriflamme • Suriname •ad personam • diazepam • tangram •ashram • telegram • milligram •epigram • centigram • dithyramb •program, programme •cardiogram • radiogram • echogram •mammogram •aerogramme (US aerogram) •microgram • dirham •electrocardiogram • ideogram •heliogram • diaphragm • diagram •parallelogram • kilogram • hologram •encephalogram • anagram •monogram • sonogram • kissogram •pentagram • cryptogram • photogram •tam-tam • wigwam • whim-wham

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CLAM

The Oxford Dictionary of Abbreviations | 1998 | | Copyright

CLAM (klæm) chemical ramjet low-altitude missile
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FRAN ALEXANDER , PETER BLAIR , JOHN DAINTITH , ALICE GRANDISON , VALERIE ILLINGWORTH , ELIZABETH MARTIN , ANNE STIBBS , JUDY PEARSALL , and SARA TULLOCH. "CLAM." The Oxford Dictionary of Abbreviations. 1998. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>.

FRAN ALEXANDER , PETER BLAIR , JOHN DAINTITH , ALICE GRANDISON , VALERIE ILLINGWORTH , ELIZABETH MARTIN , ANNE STIBBS , JUDY PEARSALL , and SARA TULLOCH. "CLAM." The Oxford Dictionary of Abbreviations. 1998. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O25-CLAM.html

FRAN ALEXANDER , PETER BLAIR , JOHN DAINTITH , ALICE GRANDISON , VALERIE ILLINGWORTH , ELIZABETH MARTIN , ANNE STIBBS , JUDY PEARSALL , and SARA TULLOCH. "CLAM." The Oxford Dictionary of Abbreviations. 1998. Retrieved February 10, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O25-CLAM.html

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Clams: sustainable and summery, suppliers hope customers clamor for...
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