photic
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Photic — Pho tic, a. [Gr. fw^s, fwto s, light.] Of or pert. to light; specif., relating to the production of light by the lower animals. [Webster 1913 Suppl.] … The Collaborative International Dictionary of English
photic — 1903, from Gk. phot , comb. form of Gk. phos (related to phainein to show, to bring to light; see PHANTASM (Cf. phantasm)) + IC (Cf. ic) … Etymology dictionary
photic — [fōt′ik] adj. [< Gr phōs (gen. phōtos), a light (see PHOSPHORUS) + IC] 1. of light 2. Biol. having to do with the effect of light upon, or the production of light by, organisms … English World dictionary
photic — adjective Date: 1843 1. of, relating to, or involving light especially in relation to organisms 2. penetrated by light especially of the sun < the photic zone of the ocean > • photically adverb … New Collegiate Dictionary
Photic sneeze reflex — is a genetic autosomal dominant trait, which causes sneezing when exposed suddenly to bright light, possibly many times consecutively. It is also referred to as photic sneeze response, sun sneezing, photogenic sneezing, the photosternutatory… … Wikipedia
Photic region — (Phytogeography) The uppermost zone of the sea, which receives the most light. [Webster 1913 Suppl.] … The Collaborative International Dictionary of English
photic zone — n. the uppermost layer in a body of water into which daylight penetrates in sufficient amounts to influence living organisms, esp. by permitting photosynthesis … English World dictionary
Photic zone — The photic zone or euphotic zone (Greek well lit ) is the depth of the water in a lake or ocean, that is exposed to sufficient sunlight for photosynthesis to occur. The depth of the photic zone can be greatly affected by seasonal turbidity.It… … Wikipedia
Photic sneeze reflex — A disorder, also known as the achoo syndrome, characterized by nearly uncontrollable paroxysms of sneezing provoked in a reflex fashion by the sudden exposure of a dark adapted subject to intensely bright light, usually to brilliant sunlight. The … Medical dictionary
photic zone — Biol. the upper layer of a body of water delineated by the depth to which enough sunlight can penetrate to permit photosynthesis. [1970 75] * * * ▪ oceanography surface layer of the ocean that receives sunlight. The uppermost 80 m (260… … Universalium
