the numerous algae that constitute the phylum Rhodophyta, which contain a red pigment in addition to chlorophyll. The group includes carrageen, dulse, and laver
Also called: red seaweed
red algae in American English
any of a division (Rhodophycota) of photosynthetic thallophytes, including reddish, brownish-red, pink, or purple algae that form shrublike masses in the depths of the oceans