词根词缀:annul-, anul-
【来源及含义】Latin: ring
【同源单词】annular, annuloaortic, annuloplasty, annulus, anular cartilage, anular ligament
词根词缀:-ulus, -olus, -ulum, -ola
【来源及含义】Latin: suffix; little, small
【同源单词】abaculus, acaulus, altocumulus, annulus, anulus, anulus ciliaris