"tending toward or productive of peace," 1866, from Greek eirēnikos, from eirēnē "peace, time of peace," a word of unknown etymology. Earlier as irenic (1864), irenical (1650s).

type of fastening for clothing, 1719, originally a belt loop for carrying a weapon, of unknown origin; perhaps from Portuguese froco, from Latin floccus "tuft of wool," a word of unknown etymology.

also malemute, type of large Eskimo dog, 1874, from name of an Eskimo tribe in northwestern Alaska that developed the breed. The native form is malimiut. Bright offers no etymology.

"having more than one form," 1886, from pleo- "more" + -morphy "form, shape," from Greek morphē "form," a word of uncertain etymology. Pleomorphous is by 1854. Related: Pleomorphism.

native people of the U.S. southern Plains, 1810, earlier in Spanish records as Caigua, from a word in the people's language (Kiowa-Tanoan). Bright offers no etymology for it.

"existing in two forms" (especially of crystals), 1801, from Greek dimorphos "of two forms," from di- (see di- (1)) + morphē "form, shape," a word of uncertain etymology.