Definition

1. Noun:
   • A bone of the pelvis: The ischium is one of the three major bones that fuse together to form each half of the adult hipbone (or coxal bone). It is the lowest and strongest of these three sections, located at the base and rear of the pelvis.
   • Anatomical structure: Specifically, it is the bone you sit on. It bears the body's weight when sitting and provides important attachment points for muscles of the lower limb and thigh.

Usage Examples

• Noun:
  • The patient sustained a fracture to the ischium in the fall.
  • The ischial tuberosity, a bony prominence of the ischium, is commonly known as the "sitting bone."
  • The three components of the hipbone are the ilium, the ischium, and the pubis.

Advanced Usage

• "Ischial" (adjective): Pertaining to the ischium.
  • The athlete suffered from ischial bursitis, an inflammation near the sitting bones.
• In anatomical terminology: Often used in compound terms to describe related structures.
  • The ischiopubic ramus is a bony bar formed by the fusion of the ischium and the pubis.

Variants and Related Words

• Ischial (adj): Of or relating to the ischium.
• Ischiadic (adj): An older or alternative term for ischial.
• Ischium is the singular form; the plural is ischia.

Synonyms

• Sitting bone (informal, usually referring to the ischial tuberosity).
• Os ischii (Latin anatomical term).

Notes on Meaning

This word has a single, specific anatomical meaning. It does not have different figurative meanings, idioms, or phrasal verbs associated with it, as it is a precise scientific term.

Noun

1. one of the three sections of the hipbone; situated below the ilium