Webster’s Revised Unabridged Dictionary · 1913
Florideæ
Flo·rid′e·æ, n. pl. [NL., from L. flos, floris, a flower.] (Bot.) A subclass of algæ including all the red or purplish seaweeds; the Rhodospermeæ of many authors; — so called from the rosy or florid color of most of the species.