1695–1705; < Neo-Latin pyriformis pear-shaped, equivalent to pyri- (for piri-; Latin pir(um) pear + -i- -i-) + -formis -form

pseudopyriform, adjective
subpyriform, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pyriform (ˈpɪrɪˌfɔːm)
(esp of organs of the body) pear-shaped
[C18: from New Latin pyriformis, from pyri-, erroneously from Latin pirum pear + -formis -form]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The nerve cells in the ganglia of the spinal nerves are pyriform in shape, and have each a single process.
They do not present any cross-striation, but contain a pyriform nucleus, which almost completely fills the cell.
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