ごかんけいせいぼおん 語幹形成母音 LinksSentence search for 語幹形成母音Sentence search for ごかんけいせいぼおんKanji details for 語, 幹, 形, 成, 母 and 音Edit in JMdict Noun1. thematic vowel; thematicLinguistics Discussions Log in to talk about this word.