a. Of or pertaining to antiphony, or alternate singing; sung alternately by a divided choir or opposite choirs. Wheatly. --
n. A book of antiphons or anthems. [ 1913 Webster ]
a. [ Gr.
a. Of or pertaining to a siphon; resembling a siphon. [ 1913 Webster ]
Siphonal stomach (Zool.),
n. (Med.) A substance employed as a hypnotic, produced by the union of mercaptan and acetone. [ 1913 Webster ]