profundal adjective 1noun 1forms 1 adjective1 •Relating to the deep zone of an inland body of water where very little sunlight penetrates; located between the limnetic and the benthic zones.However, if some of the bottom area has fine-grained sediments and is free of all conspicuous plants and algae, this area is often considered the profundal zone. — 1990 noun1 •Ellipsis of profundal zone.The ratio of Oligochaeta/Chironomidae was similar to those in profundals of oligotrophic lakes. — 1982 formsprofundals
