WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective.
(used of blood) not supplied with oxygen
Word Usage
"In aerobic mode, PuraSAF offers a small footprint, low headloss solution for BOD, and Nitrification, and in an unaerated mode as an anoxic stage for denitrification or as a low-cost tertiary solids filter that approaches sand filter quality."