Vocabulary What does 乳首 (ちくび, chikubi) mean? 乳首 (ちくび, chikubi) means nipple; teat. Quick factsReadingちくびRomajichikubiPart of speechnoun 乳首ちくびchikubinipple; teat1noun nipple; teatKanji in this word乳milk; breast首neck, head; leader, chief