柯林斯词典deca- (also deka- or dec- or dek-) 1. PREFIX denoting ten: decagon. In conjunction with scientific units the symbol da is used 表示“十” 返回 deca-剑桥词典ten; used in forming nouns 十（用以组成名词） decathlon (= a sports competition with 10 events ) （田径）十项全能运动 decahedron (= a shape with 10 faces ) 十面体 science specialized (also deka-) ten times the stated unit 十倍于某单位 a decapascal 十帕斯卡 a decametre 十米 返回 deca-