The twilight, or rather the hour between the time when one can no longer see to read and the lighting of the candles, is commonly called blindman's holiday. ![]() In reference to acting without seeing or investigating first, by 1840 of aviators flying without instruments or without clear observation, from 1919. The meaning "without opening for admitting light or seeing through" is from c. In photography, a unit on a scale used on camera lenses to indicate a sequence of f-numbers where each stop corresponds to an f-number and with each stop the. The meaning "not directed or controlled by reason" was in Old English. Although this mineral is usually black because of various impurities, the pure material is white, and it is widely used as a pigment. This is the main form of zinc found in nature, where it mainly occurs as the mineral sphalerite. The original sense would be not "sightless" but rather "confused," which perhaps underlies such phrases as blind alley (1580s Chaucer's lanes blynde), which is older than the sense of "closed at one end" (1610s). Zinc sulfide (or zinc sulphide) is an inorganic compound with the chemical formula of ZnS. ![]() Old English blind "destitute of sight," also "dark, enveloped in darkness, obscure unintelligent, lacking mental perception," probably from Proto-Germanic *blindaz "blind" (source also of Old Frisian, Old Saxon, Dutch and German blind, Old Norse blindr, Gothic blinds "blind"), perhaps, via notion of "to make cloudy, deceive," from an extended Germanic form of the PIE root *bhel- (1) "to shine, flash, burn."
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