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catatonic (adj.)[catatonic 词源字典]: 1899, from catatonia + -ic. As a noun from 1902.[catatonic etymology, catatonic origin, 英语词源]
diatonic (adj.): c. 1600, from French diatonique, from Latin diatonicus, from Greek diatonikos, from diatonos "extending; pertaining to the diatonic scale," from dia- (see dia-) + teinein "to stretch" (see tenet).
Platonic (adj.): 1530s, "of or pertaining to Greek philosopher Plato" (429 B.C.E.-c. 347 B.C.E.), from Latin Platonicus, from Greek Platonikos. The name is Greek Platon, properly "broad-shouldered" (from platys "broad;" see plaice (n.)). His original name was Aristocles. The meaning "love free of sensual desire" (1630s), which the word usually carries nowadays, is a Renaissance notion; it is based on Plato's writings in "Symposium" about the kind of interest Socrates took in young men, which originally had no reference to women. Related: Platonically.