Mon`o*sep"al*ous (?), a. [Mono- + sepal: cf. F. monos'epale.] Bot.
Having only one sepal, or the calyx in one piece or composed of the sepals united into one piece; gamosepalous.
⇒ The most recent writers restrict this term to flowers having a solarity sepal, and use gamosepalous for a calyx formed by several sepals combined into one piece. Cf. Monopetalous.
© Webster 1913.