any of various small butterflies of the family Lycaenidae having coppery wings
a reddish-brown color resembling the color of polished copper
a copper penny
a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductor
a silvery malleable metallic element that resists corrosion; used in many alloys and to coat other metals to prevent corrosion; obtained chiefly from cassiterite where it occurs as tin oxide
prepare (a metal) for soldering or brazing by applying a thin layer of solder to the surface
(psychology) a form of practice; repetition of information (silently or aloud) in order to keep it in short-term memory
a practice session in preparation for a public performance (as of a play or speech or concert); "he missed too many rehearsals"; "a rehearsal will be held the day before the wedding"
a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten; "brass is an alloy of zinc and copper"
a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)
marked by qualities giving the power to produce an intended effect; "written propaganda is less efficacious than the habits and prejudices...of the readers"-Aldous Huxley; "the medicine is efficacious in stopping a cough"
(Judaism) an initiation ceremony marking the 13th birthday of a Jewish boy and signifying the beginning of religious responsibility; "a bar mitzvah is an important social event"
confirm in the bar mitzvah ceremony, of boys in the Jewish faith