noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A form of symbiosis in which a soft-bodied organism lives entirely within a harder-bodied one uncountable
2. 2
   The trace of such relationship left in a fossil countable

Etymology

From bio- + claustration.

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