the GNU version of the Collaborative International Dictionary of English
n. plural of alga.
The Century Dictionary and Cyclopedia
A division of thallogenous chlorophyllous cryptogams found for the most part in the sea (seaweeds) or in fresh water.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves
Word Usage
"On the other hand, the fountain was hell to keep refilling throughout the winter (we couldn't let it freeze, and we hadn't emptied it of water), and the algae is a continual battle."