Source : Webster's Revised Unabridged Dictionary (1913)

Semicubium \Sem`i*cu"bi*um\, Semicupium \Sem`i*cu"pi*um\, n.
   [LL., fr. L. semi half + cupa tub, cask.]
   A half bath, or one that covers only the lewer extremities
   and the hips; a sitz-bath; a half bath, or hip bath.