The Collaborative International Dictionary of English v.0.48:

Therapeutae \Ther`a*peu"tae\, n. pl. [NL., fr. Gr. ? (pl. ?) an
   attendant, servant, physician. See Therapeutic.] (Eccl.
   Hist.)
   A name given to certain ascetics said to have anciently dwelt
   in the neighborhood of Alexandria. They are described in a
   work attributed to Philo, the genuineness and credibility of
   which are now much discredited.
   [1913 Webster] Therapeutic