noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The pineal gland.
2. 2
   a small endocrine gland in the brain; situated beneath the back part of the corpus callosum; secretes melatonin wordnet
3. 3
   The rounded end of any long bone.
4. 4
   the end of a long bone; initially separated from the main bone by a layer of cartilage that eventually ossifies so the parts become fused wordnet
5. 5
   A small upper piece of each half of an alveolus of a sea urchin.

Synonyms

All synonyms

epiphysis cerebripineal bodypineal glandpineal gland

Etymology

From epi- + -physis.

Related phrases

pineal glandsea urchin

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.