| 单词 |
photic |
| 释义 |
photic, a.|ˈfəʊtɪk|
[f. Gr. ϕῶς, ϕωτ- light + -ic.]
a. Pertaining or relating to light (orig. applied to a supposed ‘fluid’ constituting the matter of light; cf. electric fluid). So † ˈphoticated a. Obs., ? impregnated with ‘photic fluid’; ˈphotics n. pl., (a) the science of light and its intrinsic properties (sometimes used instead of optics, which properly denotes the science of sight); (b) see quot. 1875.
1843Mech. Mag. XXXVIII. 47 The photic fluid may be regarded as the base of all other traversing fluids. Ibid. 6 The photicated ether..I presume to pervade all nature. 1858Mayne Expos. Lex., Photica, term for the doctrine of the nature and appearance of light: photics. 1875Knight Dict. Mech., Photics{ddd}the term originated in the United States Patent Office, and is there applied to that class of mechanical inventions embracing lamps, gas-light arrangements, and illuminating apparatus generally. 1919Jrnl. Exper. Zool. XXIX. 254 Tactile receptors, photic receptors, and chemoreceptors [of chitons] are physiologically distinct. 1957G. E. Hutchinson Treat. Limnol. I. xiii. 757 The rather feeble photic requirements of the purple bacteria. 1971Nature 30 Apr. 579/2 The clam has just been placed on its side and, in response to both tactile and photic disturbance (a shadow cast on the exposed tissues), has tightly closed its valves. 1973Black Panther 18 Aug. 8/3 The photic driver..uses flashing infrared light and pulsing ultrasonic noise to pull brain waves from their normal frequency. The subjected individual sees and hears nothing, becomes lethargic, dizzy, perhaps nauseous, and may suffer epileptic fits.
b. Applied to the parts of the oceans penetrated by sufficient sunlight for the growth of plants.
1903W. R. Fisher tr. Schimper's Plant-Geogr. 782 Three chief stages of brightness may be distinguished: 1. The photic or bright region, in which the intensity of light is sufficient for the normal development of macrophytes. 1972A. Laurie Living Oceans iv. 88 For small, slow-moving animals the twilight zone is also a safer habitat than the photic zone, which is the home of many active predators, especially fast-moving fish. Ibid. vi. 126 The photic zone of the oceans reaches down to a depth of 650 feet below the surface, which is deeper than the continental shelf. The entire shelf sea lies within the photic zone.
Hence ˈphotically adv., by light.
1960Recent Adv. Biol. Psychiatry II. 181 Photically evoked cerebral patterns have been studied. 1971Jrnl. Gen. Psychol. LXXXIV. 22 Later components of the photically evoked cortical potential. |
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