||E*phip"pi*um (?), n. [L., saddle cloth, fr. Gr. ?; 'epi` on + "i`ppos horse.] 1. (Anat.) A depression in the sphenoid bone; the pituitary fossa.
2. (Zoöl.) A saddle-shaped cavity to contain the winter eggs, situated on the back of Cladocera.