2os
(os 
, os'ă)
Plural: ossa
[L. os, stem oss-, bone]
Bone; a bone.
SEE: bone.
o. hamatum The hooked bone on the ulnar side of the distal row of the carpus (wrist). SYN: unciform bone.
o. hyoideum The horseshoe-shaped bone lying at the base of the tongue. SYN: hyoid bone.
o. innominatum The innominate (hip) bone.
o. magnum The third bone in the second distal row of the carpus. SYN: capitatum.
o. orbiculare The tiny bone in the ear that becomes attached to the incus, forming the lenticular process.
o. peroneum A bone occasionally found in the tendon of the peroneus longus muscle.
o. planum 1Any bone that has only a slight thickness; a flat bone.2The orbital plate of the ethmoid bone.
o. pubis The anteroinferior part of the hip bone; the pubic bone. In the adult, it and the ilium and ischium form the pelvic bone. The superior and inferior rami unite medially to form the pubic symphysis; at its lateral end the pubic bone forms part of the acetabulum.
o. trigonum A bone of the foot that develops from an extra center of ossification along the posterior surface of the talus.
o. vesalianum A bone that develops from the ossification of the posterior tubercle of the fifth metatarsal.