noun.
Any of various ornamental, mostly climbing plants of the genus Clematis in the buttercup family, native chiefly to northern temperate regions and having showy, variously colored flowers or decorative fruit clusters.
The Century Dictionary and Cyclopedia
noun.
A genus of plants, mostly herbaceous climbers. natural order Ranunculaceæ.
noun.
[lowercase] A plant of the genus Clematis.
the GNU version of the Collaborative International Dictionary of English
noun.
A genus of flowering plants, of many species, mostly climbers, having feathery styles, which greatly enlarge in the fruit; -- called also virgin's bower.