a. Bot. rare–1. [ad. mod.L. unipetal-us (whence F. unipétalé): see UNI- and PETALOUS a.] (See quot.)
1849. J. H. Balfour, Man. Bot., 178. A corolla rarely consists of one petal, and when this occurs … it depends on the abortion or non-development of others. Such a corolla is unipetalous..., a term quite distinct from monopetalous.
