語源 www.etymonline.com Old English of, unstressed form of æf (prep., adv.) "away, away from," from Proto-Germanic af (source also of Old Norse af, Old Frisian af, of "of," Dutch af "off, down," German ab "off, from, down"), from PIE root …

語源 www.etymonline.com early 13c., "skill as a result of learning or practice," from Old French art (10c.), from Latin artem (nominative ars) "work of art; practical skill; a business, craft," from PIE ar(ə)-ti- (source also of Sanskrit r…