occasionally psychodelic, "producing expanded consciousness through heightened awareness and feeling," 1956, of drugs, suggested by British-born Canadian psychiatrist Humphry Osmond in a letter to Aldous Huxley and used by Osmond in a scientific paper published the next year; from Greek psykhē "mind" (see psyche) + dēloun "make visible, reveal" (from dēlos "visible, clear," from PIE root *dyeu- "to shine").
In popular use from 1965 with reference to anything producing effects or sensations similar to the common perception of the effects of a psychedelic drug. As a noun, "a psychedelic drug," from 1956.
"affection of the skin characterized by simple itching without visible eruption," 1650s, from Latin pruritus, past participle of prurire "to itch" (see prurient). The word was earlier in English via Old French in form prurite (early 15c.). Related: Pruritic.
also discernable, "perceptible, visible, observable," 1560s, from French discernable, from discerner "distinguish (between), separate" (see discern). Form with -a- was more common at first; spelling changed to -i- 17c. to conform to Late Latin discernibilis. Related: Discernibly.
late Old English betacnian "to denote, to mean, signify; be a visible sign or emblem of," from be- + Old English tacnian "to signify," from tacn "sign" (see token) or from Proto-Germanic *taiknōjanan. From c. 1200 as "to augur, presage, portend," also "be or give evidence of." Related: Betokened; betokening.