- living or found near or in the deepest part of a body of water.
- sinking to or deposited on the bottom of a body of water.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- living or occurring on the bottom of a sea or a lakedemersal fish
C19: from Latin dēmersus submerged (from dēmergere to plunge into, from mergere to dip) + -al 1