Piriform

Piriform, sometimes pyriform, means pear-shaped (from Latin pirum "pear" and forma "shape").

It may also refer to:

Going pear-shaped

 * Going wrong or going pear-shaped

Anatomy

 * Piriform aperture, more commonly known as anterior nasal aperture
 * Piriform cortex, a region in the brain
 * Piriformis muscle, a gluteal muscle
 * Piriformis syndrome, a neuromuscular disorder in which piriformis muscle compresses the sciatic nerve
 * Piriform sinus, piriform recess or piriform fossa, synonyms referring to one of the four sites of the hypopharynx
 * the pear female body shape

Other uses

 * Piriform (company), a software company
 * Piriform, in hydrostatic equilibrium
 * Pyriform, a teapot shape introduced in the 18th century