Lewis Short
ālĭpĭlus (noun M) : ala- 1. pilus
* A slave who plucked the hair from the armpits of the bathers (cf. ala, II.): alipilum cogita tenuem et stridulam vocem,Sen. Ep. 56, 2: M. OCTAVIVS PRIMIGENIVS ALIPILVS A TRITONE,Inscr. Grut. 812, 6 (cf. Inscr. Orell. 4302).
Charlton T. Lewis, Charles Short, A Latin Dictionary