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used in various senses in English; Latin, literally "little head," diminutive of caput "head," also "leader, guide, chief person; summit; capital city; origin, source, spring," figuratively "life, physical life;" in writing "a division, paragraph;" of money, "the principal sum," from PIE *kaput- "head" (see head (n.)).
capitulum ca·pit·u·lum (kə-pĭch'ə-ləm)
n. pl. ca·pit·u·la (-lə)
A small head or rounded articular extremity of a bone.