英语词源字典 - 在线词源网站

curtail (v.)[curtail 词源字典]: late 15c., from Middle French courtault "made short," from court "short" (Old French cort, from Latin curtus; see curt) + -ault pejorative suffix of Germanic origin. Originally curtal; used of horses with docked tails, which probably influenced the spelling in general use; curtal is retained in poetics to describe a "shortened" stanza or poem. Related: Curtailed; curtailing.[curtail etymology, curtail origin, 英语词源]
dyad (n.): 1670s, from Latin dyad-, stem of dyas, from Greek dyas "the number two, a group of two," from duo "two" (see two). Specific sense in chemistry ("a bivalent element") is by 1865; also used in biology, poetics, mathematics. Related: Dyadic.
poetic (adj.): 1520s, from poet + -ic, or else from or influenced by Middle French poetique (c. 1400), from Latin poeticus, from Greek poietikos "pertaining to poetry," literally "creative, productive," from poietos "made," verbal adjective of poiein "to make" (see poet). Related: Poetics (1727). Poetic justice "ideal justice as portrayed in plays and stories" is from 1670s. Poetic license attested by 1733.

Earlier adjective was poetical (late 14c.); also obsolete poetly (mid-15c.). Related: Poetically (early 15c.).
rotund (adj.): 1705, from Latin rotundus "rolling, round, circular, spherical, like a wheel," from rota "wheel" (see rotary). Earlier was rotound (1610s); rotounde (early 15c.). Meaning "full-toned style of oratory" (1830) is after Horace's ore rotundo in "Poetics."