Fissure

in ordinary language, a cleft; a narrow opening made by the parting or opening of any substance; a crack. In botany the opening of seed-ve els, anthers ete. In heraldry, the fourth part of the bend sinister. In geology, a crack in the strata, produced Ld voleanic or earthquake action, subsidence, or any other cause. _ Fistula. In surgery, a long and sinuous ulcer, having a narrow opening, and sometimes leading to a large eavity, and which has no disposition to heal.