piriformis

• pyriformis

Unadapted borrowing from New Latin pirifōrmis, ellipsis of mūsculus pirifōrmis (“pear-shaped muscle”). Doublet of piriform.

• (Received Pronunciation) IPA^(key): /ˌpɪ.ɹɪˈfɔː.mɪs/
• (General American) IPA^(key): /ˌpɪɹ.əˈfɔɹ.mɪs/

piriformis (plural piriformes)

1. (anatomy, zootomy) A gluteal muscle which arises from the front of the sacrum and the ischium or sacrotuberous ligament, passes out of the pelvis through the greater sciatic foramen, and inserts into the greater trochanter of the femur, serving in humans to rotate the thigh laterally.

• piriformis syndrome

• “pyriformis”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.
• “piriformis”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.

• pyrifōrmis

From pirum (“a pear”) +‎ -fōrmis (“-form, -shaped”, adjectival suffix).

• (Classical Latin) IPA^(key): /pi.riˈfoːr.mis/, [pɪrɪˈfoːrmɪs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /pi.riˈfor.mis/, [piriˈfɔrmis]

pirifōrmis (neuter pirifōrme); third-declension two-termination adjective (New Latin)

1. pear-shaped, pyriform

Third-declension two-termination adjective.

• → English: pyriform, piriform; piriformis, pyriformis
• → Spanish: piriforme