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
 
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