(pil'ăr )

An upright support, column, or structure resembling a column.

p.s of the diaphragm Crura of diaphragm

p.s of the fauces Folds of mucous membrane, one on each side of the fauces and between which is situated the palatine tonsil. The anterior pillar (anterior to the tonsil) is also called the glossopalatine arch and the palatoglossal arch; the posterior pillar (behind the tonsil) is also called the glossopharyngeal arch, the palatopharyngeal arch, and the pharyngopalatine arch.

posterior p.sCrura of the fornix.