division Rhodophyta di·vi·sionr·hodophyta uncommon noun 1. lower plants; mostly marine and littoral eukaryotic algae SynonymsRhodophytadivision Rhodophyta Related words Broader terms division Parts Protoctista Part of Rhodophyceaered algae WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.