RAPHE

noun Etymology: New Latin, from Greek rhaphē seam, from rhaptein to sew Date: circa 1753 the seamlike union of the two lateral halves of a part or organ (as the tongue) having externally a ridge or furrow, 2. the part of the stalk of an anatropous ovary that is united in growth to the outside covering and forms a ridge along the body of the ovule, the median line or slit of the valve of certain diatoms