ほじょいす 補助椅子 LinksSentence search for 補助椅子Sentence search for ほじょいすSentence search for 補助いすKanji details for 補, 助, 椅 and 子Edit in JMdict Noun1. auxiliary seat; booster seat; baby seatOther forms補助いす 【ほじょいす】 Discussions Log in to talk about this word.