noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The outermost layer of cells (pinacocytes) in the phylum Porifera (sponges), equivalent to the epidermis, and characterized as an epithelial layer of flattened cells.

Etymology

From Ancient Greek πίναξ (pínax, “tablet, dish, plank”) + -derm.

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