Webster's Revised Unabridged Dictionary · 1913

Bidet

Bidet ({not transcribed}) , noun

[French bidet, perh. from Celtic; cr. Gael. bideach very little, diminutive, bidein a diminutive animal, Welsh bidan a weakly or sorry wretch.]

1.
A small horse formerly allowed to each trooper or dragoon for carrying his baggage. — B. Jonson
2.
A kind of bath tub for sitting baths; a sitz bath.