تلفظ بین المللی : /vˈɒluːbˌaɪl/ تلفظ : [v'0lu:b,aIl]
English
Turning, or whirling; winding; twining; voluble.
A genus of small rubiaceous herbs, having tetramerous salveform blue or white flower. There are about twenty species, natives of North America. Also, a plant of this genus.
