circular
adj.
late 14c., from Anglo-French circuler, Old French circuler "circular" (14c., Modern French circulaire), from Latin circularis, from circulus (see circle, n.). The metaphoric circular firing squad is attested by 1990.
n.
1550s, "circular figure," from circular, adj.. Meaning "a notice circulated" is from 1818.
〔李〕[circ;-ulara.] a.圆环的； 圆周的 ←circ ( L circus)=ring 圆，环
〔蒋〕[circul=circle圆，-ar形容词后缀，…的] 圆形的，环形的