11. (Mus.) A vertical line across the staff. Bars divide the staff into spaces which represent measures, and are themselves called measures.
A double bar marks the end of a strain or main division of a movement, or of a whole piece of music; in psalmody, it marks the end of a line of poetry. The term bar is very often loosely used for measure, i.e., for such length of music, or of silence, as is included between one bar and the next; as, a passage of eight bars; two bars' rest.
12. (Far.) pl. (a) The space between the tusks and grinders in the upper jaw of a horse, in which the bit is placed. (b) The part of the crust of a horse's hoof which is bent inwards towards the frog at the heel on each side, and extends into the center of the sole.