Ephippium

‖E‐phip″pi‐um (?), n. [L., saddle cloth, fr. Gr. �; επἴ on + ἵπποσ 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.