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caddy [caddy 词源字典]: caddy: [18] Caddy comes ultimately from Malay katī, which was a measure of weight equal to about 0.6 kilos or 1½ pounds: it was thus originally ‘container which holds one caddy of tea’. English acquired the word in the 16th century as catty, and it is not altogether clear where the -dd- spelling came from. It has no connection with the golfer’s caddie (see CADET).
[caddy etymology, caddy origin, 英语词源]
paint (v.): early 13c., "represent in painting or drawing, portray;" early 14c., "paint the surface of, color, stain;" from Old French peintier "to paint," from peint, past participle of peindre "to paint," from Latin pingere "to paint, represent in a picture, stain; embroider, tattoo," from PIE root *peig- (1), also *peik- "to cut" (cognates: Sanskrit pimsati "hews out, cuts, carves, adorns," Old Church Slavonic pila "file, saw," Lithuanian pela "file").

Sense evolution between PIE and Latin was, presumably, from "decorate with cut marks" to "decorate" to "decorate with color." Compare Sanskrit pingah "reddish," pesalah "adorned, decorated, lovely," Old Church Slavonic pegu "variegated;" Greek poikilos "variegated;" Old High German fehjan "to adorn;" Old Church Slavonic pisati, Lithuanian piesiu "to write." Probably also representing the "cutting" branch of the family is Old English feol (see file (n.2)).

To paint the town (red) "go on a spree" first recorded 1884; to paint (someone or something) black "represent it as wicked or evil" is from 1590s. Adjective paint-by-numbers "simple" is attested by 1970; the art-for-beginners kits themselves date to c. 1953.
platy: "A small live-bearing freshwater fish of Central America, which is popular in aquaria", Early 20th century: colloquial abbreviation of modern Latin Platypoecilus (former genus name), from Greek platus 'broad' + poikilos 'variegated'.
poikilo-: "Variegated", From Greek poikilos 'variegated, varied'.