| undecylenic acid | (n) an acid that is a component of perspiration |
| Undecyl | n. [ Undecane + -yl. ] (Chem.) The radical regarded as characteristic of undecylic acid. [ 1913 Webster ] |
| Undecylenic | a. (Chem.) Pertaining to, or designating, an acid |
| Undecylic | a. (Chem.) Related to, derived from, or containing, the undecyl radical; specifically, designating that member of the fatty acids which corresponds to undecane, and is obtained as a white crystalline substance, |