Added 9 October 2026 algae /ˈæl.d͡ʒi/ noun Categories: AnimalsUncommon Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about algae at Wordnik → Where our words come from → Primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves. Related Words: kelpseaweedbloomweeddaphniainhibitionwagesalarybloomsmicroalgaerockweedsseaweeds Back to today's word