Where does “乳首” come from?

乳首 (Japanese) comes from Japanese 首, from Middle Chinese 首.

乳首 (Japanese): a nipple

Definitions

  1. a nipple

Ancestry of “乳首”, step by step

乳首 traces back through two separate lines of ancestry.

via Japanese 首

StepLanguageWordMeaning
1Japanese首neck; the neck and head as a whole; dismissal...
2Middle Chinese首—

via Japanese 乳

StepLanguageWordMeaning
1Japanese乳milk; breast

Words derived from “乳首”

Every word from Middle Chinese 首 →Every word from Japanese 首 →