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