phototaxis (usually uncountable, plural phototaxes)
(biology) The movement of an organism either towards or away from a source of light
• phototaxy
Source: Wiktionary
Pho`to*tax"is, Pho"to*tax`y, n. [NL. phototaxis; photo- + Gr. an arranging.] (Biol.)
Definition: The influence of light on the movements of low organisms, as various infusorians, the zoöspores of certain algæ, etc.; also, the tendency to follow definite directions of motion or assume definite positions under such influence. If the migration is toward the source of light, it is termed positive phototaxis; if away from the light, negative phototaxis. --Pho`to*tac"tic (#), a. --Pho`to*tac"tic*al*ly, adv.
Source: Webster’s Unabridged Dictionary 1913 Edition
12 February 2025
(noun) an abnormal enlargement of the colon; can be congenital (as in Hirschsprung’s disease) or acquired (as when children refuse to defecate)
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