Definition

Noun: - A small pyramidal carpal bone in the proximal row of the wrist: The os triquetrum is one of the eight small carpal bones of the wrist. It is located in the proximal row, on the medial (ulnar) side of the wrist, articulating with the pisiform, hamate, and lunate bones. It is also known as the triquetral bone, triquetrum, or cuneiform bone.

Usage Examples

• Noun:
  • A fracture of the os triquetrum is a common injury following a fall on an outstretched hand.
  • The os triquetrum forms part of the wrist joint and contributes to its complex range of motion.

Advanced Usage

• Anatomical context: The term is used almost exclusively in medical, anatomical, and clinical contexts.
  • The surgeon identified a ligamentous attachment on the dorsal surface of the os triquetrum.

Variants and Related Words

• Triquetral bone (n): A synonym for os triquetrum.
• Triquetrum (n): The shortened, more common form in anatomical terminology.
• Cuneiform bone (n): An older, less specific synonym (note: this term can also refer to bones in the foot).

Synonyms

• Triquetral
• Triquetral bone
• Cuneiform bone (of the wrist)

Notes on Meaning

This word has a single, highly specific anatomical meaning. It does not have idiomatic uses or phrasal verbs.

Noun

1. a wrist bone that articulates with the pisiform and hamate and lunate bones