noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The thalline margin of a lecanorine apothecium.
2. 2
   The external cell layers of the developing sporangium of a bryophyte.

Etymology

From amphi- + thecium.

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