Pronunciation: (ā'pi-kul, ap'i-), [key]
1. of, at, or forming the apex.
2. Phonet.(of a speech sound) articulated principally with the aid of the tip of the tongue, as t or d.
Phonet.an apical sound.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.