Vocabulary What does 内分泌 (ないぶんぴ, naibunpi) mean? 内分泌 (ないぶんぴ, naibunpi) means endocrine. Quick factsReadingないぶんぴRomajinaibunpi 内分泌ないぶんぴnaibunpiendocrine1adj-f endocrine2noun incretion; internal secretionKanji in this word内inside, internal分part, to divide; minute; to understand泌oozing, secreting, seeping