Foxtail \Fox"tail`\, n. 1. The tail or brush of a fox. [1913 Webster] 2. (Bot.) The name of several kinds of grass having a soft dense head of flowers, mostly the species of {Alopecurus} and {Setaria}. [1913 Webster] 3. (Metal.) The last cinders obtained in the fining process. --Raymond. [1913 Webster] {Foxtail saw}, a dovetail saw. {Foxtail wedging}. See {Fox wedge}, under {Fox}. [1913 Webster] fox trot