Source : Webster's Revised Unabridged Dictionary (1913)

Priapulacea \Pri*ap`u*la"ce*a\, n. pl. [NL. See {Priapism}.]
   (Zo["o]l.)
   A suborder of Gephyr[ae]a, having a cylindrical body with a
   terminal anal opening, and usually with one or two caudal
   gills.