The adjective is used as synonymous with ornamented, embroidered, decorated, figurate, etc., chiefly with reference to contrapuntal music in which the lines move largely in relatively quick notes from one beat to the next. Thus, the works of the early Flemish masters are said to be in florid style. Florid counterpoint specifically denotes the use of ornamented lines in the teaching of counterpoint.
Harvard Dictionary of Music 1958
Copyright, 1944 by the president and fellows of Harvard college – Cambridge, Massachusetts