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