GNU Collaborative International Dictionary of English

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1.       
   ‖Florideæ , prop. 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.
   1913 Webster