メス

1799, Shogakukan Nihon Kokugo Daijiten cites 蘭説弁惑 for めす and gives Dutch mes as the source. In Dutch, mes means knife; the Etymologisch Woordenboek records Middle Dutch mes as a cutting tool from 1240. The Japanese medical word is therefore not English mess and not French mets. Its spelling simply adapts the Dutch one-syllable noun to Japanese メス. The route is the Dutch medical channel of Edo Rangaku, tied to Nagasaki, anatomy books, and later modern surgery. Earlier Japanese could explain めす as 庖刀, a kitchen knife, but in medical use it narrows to the small knife used for incision or dissection. By Meiji medicine, メス stands with ピンセット, ガーゼ, カテーテル, and アルコール in a Western clinical vocabulary. Modern Japanese メス usually means scalpel, surgical knife, or analytical intervention in phrases such as メスを入れる. Heibonsha Sekai Daihyakka notes English scalpel or knife and German Messer. English mes is not a normal medical noun; the direct English equivalent is scalpel. Dutch still uses mes for ordinary knives, while Japanese reserves メス for clinical or investigative contexts. A short example is 外科医がメスを持つ, a surgeon holds a scalpel.