apex

One entry found for apex.

Main Entry: apex
Pronunciation: -peks
Function: noun
Inflected Form(s): plural apex·es or api·ces /-p-sz/
: a narrowed or pointed end of an anatomical structure: as a : the narrow somewhat conical upper part of a lung extending into the root b : the lower pointed end of the heart situated in humans opposite the space between the cartilages of the fifth and sixth ribs on the left side c : the extremity of the root of a tooth