Phototaxis Pho`to*tax"is, Phototaxy Pho"to*tax`y, n. [NL. phototaxis; photo- + Gr. ? an arranging.] (Biol.) The influence of light on the movements of low organisms, as various infusorians, the zo["o]spores of certain alg[ae], 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. [Webster 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • phototactically — adverb see phototactic …   New Collegiate Dictionary

  • phototactically — See phototactic. * * * …   Universalium

  • phototactically — adv. in a phototactic manner, by moving in response to light (Biology) …   English contemporary dictionary

  • phototactically — pho·to·tac·ti·cal·ly …   English syllables

  • phototactically — adverb see phototactic …   Useful english dictionary

  • phototactic — adjective Etymology: International Scientific Vocabulary Date: 1882 of, relating to, or exhibiting phototaxis • phototactically adverb …   New Collegiate Dictionary

  • phototaxis — phototactic /foh teuh tak tik/, adj. phototactically, adv. /foh teuh tak sis/, n. Biol. movement of an organism toward or away from a source of light. Also, phototaxy. [1900 05; PHOTO + TAXIS] * * * …   Universalium

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