co-grandmotherWiktionary 原文英美构词拆解co-前缀+grandmother词干co-Together: the root word is done co-incidently. · Having commonality, similarity with respect to the root.词源说明co- + grandmother释义名词noun1the mother of one's son- or daughter-in-law, as common grandmother of their children; the relationship between women who have grandchildren in common; maternal grandmother vis-à-vis paternal grandmother.同族词相关词 2co-in-law·co-aunt