What is "apocynaceous"

Apocynaceous \A*poc`y*na"ceous\, Apocyneous \Ap`o*cyn"e*ous\, a. [Gr. ? dogbane; ? from + ? dog.] (Bot.) Belonging to, or resembling, a family of plants, of which the dogbane ( Apocynum) is the type.

a. (context botany English) Of the family Apocynaceae, which contains the periwinkle and oleander.

adj. of or relating to tropical plants of the family Apocynaceae