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Hydatidiform Mole Hydatidiform Mole
Hydatidiform Mole Definition A hydatidiform mole is a relatively rare condition in which tissue around a fertilized egg that normally would have developed into the placenta instead develops as an abnormal cluster of cells. (This is also called a molar pregnancy.) This grapelike mass forms inside... Read more
mole (animal) mole (animal)
mole in zoology, common name for the small, burrowing, insectivorous mammals of the family Talpidae, found throughout the temperate Northern Hemisphere. Moles are trapped as pests, although they probably do less damage than the animals they destroy, and for their fur, which is highly valued.... Read more
insectivore insectivore
insectivore , term broadly given to any insect-eating animal or plant. More specifically, the term refers to mammals of the order Insectivora (see Chordata ), including the shrew , mole , hedgehog , tenrec , and solenodon . Insectivores are small animals, ranging from 2 to 16 in. (5-40 cm) in... Read more
naked mole rat naked mole rat
naked mole rat name applied to a species ( Heterocephalus glaber ) of small rodents found in E Africa, whose members—the only hairless rodents—live entirely in underground communities of 80 or more individuals with a structure resembling that of social-insect colonies. Colony members... Read more
Moles Moles
Moles Definition A mole (nevus) is a pigmented (colored) spot on the outer layer of the skin (epidermis). Description Moles can be round, oval, flat, or raised. They can occur singly or in clusters on any part of the body. Most moles are brown, but colors can range from pinkish flesh tones to... Read more
concentration concentration
concentration in chemistry, measure of the relative proportions of two or more quantities in a mixture . The concentration of a solute is very important in studying chemical reactions because it determines how often molecules collide in solution and thus indirectly determines the rates of... Read more
pH pH
pH range of numbers expressing the relative acidity or alkalinity of a solution. In general, p H values range from 0 to 14. The p H of a neutral solution, i.e., one which is neither acidic nor alkaline, is 7. Acidic solutions have p H values below 7; alkaline, or basic, solutions have p H... Read more
birthmark birthmark
birthmark pigmented maldevelopment of the skin that varies in size, either present at birth or developing later. Birthmarks may appear as moles (melanocytic nevi) that vary in color from light brown to blue, and are either flat or raised above the surface of the skin. They are usually benign, but... Read more
mole (chemistry) mole (chemistry)
mole in chemistry, a quantity of particles of any type equal to Avogadro's number, or 6.02×10 23 particles. One gram-molecular weight of any molecular substance contains exactly one mole of molecules. The term mole is often used in place of gram-molecular weight; e.g., one speaks of 18... Read more
Pharos Pharos
Pharos , peninsula, extending into the Mediterranean Sea, N Egypt, NE Africa, forming two harbors at Alexandria. Originally an island, it was joined to the mainland by a mole, constructed by order of Alexander the Great. On Pharos stood the celebrated lighthouse completed (c.280 BC) by Ptolemy II,... Read more

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