in botany, "bearing many (more than three) flowers," 1834, from Late Latin multiflorus "many-flowered" (see multiflora) + -al (1).
Entries linking to multifloral
multiflora n.
1829, in reference to a type of rose bearing several flowers on one stem, from Latin multiflora (rosa), from fem. of multiflorus, "abounding in flowers," from multi- "many" (see multi-) + flor-, stem of flos "flower" (see florid). Multiflorous "many-flowered" is attested by 1760, from Latin multiflorus.
-al 1
suffix forming adjectives from nouns or other adjectives, "of, like, related to, pertaining to," Middle English -al, -el, from French or directly from Latin -alis (see -al (2)).