Yours, Etc.: Origins and Uses of 8 Sign-Offs
c.1600, from French dépilatorie (adj.), from Latin depilatus "having one's hair plucked," from de- "completely" (see de-) + pilatus, past participle of pilare "deprive of hair," from pilus "hair" (see pile (n.3)). Earlier in same sense was Depilative. As a noun from c.1600, from French dépilatorie (n.).
depilatory de·pil·a·to·ry (dĭ-pĭl'ə-tôr'ē)
Having the capability to remove hair. n.
A preparation in the form of a liquid or cream that is used to remove unwanted hair from the body. Also called epilatory.