1520s, "liable to customs or dues;" c. 1600, "according to established usage, habitual," from Medieval Latin custumarius, from Latin consuetudinarius, from consuetitudinem (see custom (n.)). In Middle English it was a noun, "written collection of customs" of a manor or community. Earlier words for "according to established usage" were custumal (c. 1400, from Old French), custumable (c. 1300). Related: Customarily.
native people of Peru and surrounding regions, 1811, from Spanish, according to OED from Quechua (Inca) kechua "plunderer, destroyer." Also the name of their language. Related: Quechuan.
place in California; according to Bright, the name is Obsipeño (Chumashan) /pismu'/ "tar, asphalt," literally "the dark stuff," from /piso'/ "to be black, dark."
"incompetent or foolish but likeable person," by 1930 (according to Partridge). There was a character Little Mook in a series of children's stories c. 1900.
great desert of northern Africa, 1610s, from Arabic çahra "desert" (plural çahara), according to Klein, noun use of fem. of the adjective asharu "yellowish red." Related: Saharan.