うまぬし 馬主 Common word LinksSentence search for 馬主Sentence search for うまぬしSentence search for ばしゅSentence search for ばぬしKanji details for 馬 and 主Edit in JMdict Noun1. owner of a horse (esp. racehorse)Noun2. registered owner (of a racehorse)Only applies to うまぬしOther forms馬主 【ばしゅ】、馬主 【ばぬし】 Discussions Log in to talk about this word.