rudimentn. 基礎、入門、雛形、退化器官原基、始基、殘遺器官、痕跡器官、遺蹟學術名詞原基:動物學退行:動物學痕跡:動物學1.器官原基:植物學2.退化器官:植物學英文釋義the remains of a body part that was functional at an earlier stage of life