Definitions

1. adjective

relating to or dwelling in the interstices of rocks, sand, etc., especially marine organisms that live in or near the bottom of a sea, ocean, or lake.

“The infaunal species of the coral reef were affected by the recent pollution.”

2. noun

organisms that live in the interstices of rocks, sand, etc., especially marine organisms that live in or near the bottom of a sea, ocean, or lake.

“The infaunal community in the lake was studied by the researchers.”