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. 2014.

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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 — [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 — Relating to light. * * * pho·tic fōt ik adj of, relating to, or involving light esp. in relation to organisms <photic stimulation> pho·ti·cal·ly fōt i k(ə )lē adv * * * pho·tic (foґtik) pertaining to light …   Medical 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

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