Tooth, Teeth <1,,3599, odous>
is used in the sing. in Mat 5:38 (twice); elsewhere in the plural, of "the gnashing of teeth," the gnashing being expressive of anguish and indignation, Mat 8:12, Mat 13:42, Mat 13:50, Mat 22:13, Mat 24:51, Mat 25:30, Mar 9:18, Luk 13:28, Act 7:54; in Rev 9:8, of the beings seen in a vision and described as locusts.
