proembryoWiktionary 原文构词拆分pro-前缀agreeing with; supporting; favouring · substituting for+embryo词根/词干词源说明From pro- + embryo.释义（英文）名词 Noun(botany) A cluster of cells in the ovule of a fertilized flowering plant that has not yet formed into an embryo.(botany) The protonema of mosses