piriform pir·i·form (pĭr’ə-fôrm’, pī’rə-) adj. Shaped like a pear.
Public Interest Research Group
- Piriform muscle
piriform muscle n. A muscle with origin from the margins of the pelvic sacral foramina and the sciatic notch of the ilium, with insertion into the great trochanter, with nerve supply from the sciatic plexus, and whose action rotates the thigh laterally.
/ˈpaɪpˌfɪtɪŋ/ noun 1. 2. the threaded gland nuts, unions, adaptors, etc, used for joining pipes