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

Look up pyriform or pear-shaped in Wiktionary, the free dictionary.

It may also refer to:

• Going wrong or going pear-shaped

• 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

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

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