effloresce

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ef·flo·resce / ˌefləˈres/ • v. 1. [intr.] (of a substance) lose moisture and turn to a fine powder upon exposure to air. ∎  (of salts) come to the surface of brickwork, rock, or other material and crystallize there. ∎  (of a surface) become covered with salt particles. 2. reach an optimum stage of development; blossom: simple concepts that effloresce into testable conclusions. DERIVATIVES: ef·flo·res·cence / -ˈresəns/ n. ef·flo·res·cent adj.

The Oxford Pocket Dictionary of Current English
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effloresce •acquiesce, address, assess, Bess, bless, bouillabaisse, caress, cess, chess, coalesce, compress, confess, convalesce, cress, deliquesce, digress, dress, duchesse, duress, effervesce, effloresce, evanesce, excess, express, fess, finesse, fluoresce, guess, Hesse, impress, incandesce, intumesce, jess, largesse, less, manageress, mess, ness, noblesse, obsess, oppress, outguess, phosphoresce, politesse, possess, press, priestess, princess, process, profess, progress, prophetess, regress, retrogress, stress, success, suppress, tendresse, top-dress, transgress, tress, tristesse, underdress, vicomtesse, yes •Jewess • shepherdess • Borges •battledress • Mudéjares • headdress •protectress • egress • ingress •minidress • nightdress • congress •sundress • procuress • murderess •letterpress • watercress • shirtdress •access

Oxford Dictionary of Rhymes
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effloresce burst forth as in flower; change to fine powder. XVIII. — L. efflōrēscere, f. EF- + flōrēscere (see FLORESCENCE).
So efflorescence XVII, efflorescent XIX.

The Concise Oxford Dictionary of English Etymology T. F. HOAD