obdeltoidWiktionary 原文构词拆分ob-前缀(no longer productive) Against; facing; a combining prefix found in verbs of Latin origin. · (botany) Of a reversed shape.+deltoid词根/词干词源说明From ob- + deltoid.释义（英文）形容词 Adjective(botany, of leaves) Triangular and attached to the stem via a tip.