from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Dwelling at or near the bottom of a body of water: a demersal fish.
- adj. Sinking to or deposited near the bottom of a body of water: demersal fish eggs.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. That lives near the sea bed and lake bed
from The Century Dictionary and Cyclopedia
- Having so great a specific gravity as to sink in water: said of fish-eggs.
From Latin dēmersus, past participle of dēmergere, to sink : dē-, de- + mergere, to sink.(American Heritage® Dictionary of the English Language, Fourth Edition)