unciform

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Uncinate.

from The Century Dictionary.

• Uncinate in form; hooked or crooked; hook-like: specifically applied in anatomy to certain hook-like processes of bone: as, the unciform process of the ethmoid; the unciform process of the unciform bone.
• noun In anatomy and zoology, one of the bones of the wrist, so called from its hook-like process; a carpal bone of the distal row, the innermost one on the ulnar or little-finger side, in special relation with the heads of the fourth and fifth metacarpals, supposed to represent carpalia IV and V of the typical carpus. See carpus, and cuts under Artiodactyla, Perissodactyla, hand, pisiform, and scapholunar.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Having the shape of a hook; being of a curved or hooked form; hooklike.
• adjective (Anat.) a bone of the carpus at the bases of the fourth and fifth metacarpals; the hamatum.
• noun (Anat.) The unciform bone. See Illust. of perissodactyla.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Of the shape of a hook; hook-shaped.
• noun The hamate bone.