A crack, or longitudinl fissure.
2. A breach or separation, as in a political party; a division.
3. A piece that is split off, or made thin, by splitting; a splinter; a fragment.
4. Specif, one of the sections of a skin made by dividing it into two or more thicknesses.
5. (Science: veterinary) A division of a stake happening when two cards of the kind on which the stake is laid are dealt in the same turn.