raphe

(anatomy) A seamlike ridge or furrow on an organ, bodily tissue, or other structure, typically marking the line where two halves or sections fused in the embryo.

The connecting ridge between the two halves of the medulla oblongata or the tegmentum of the midbrain.

(botany) 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.

(botany) A longitudinal median groove in the valve of many diatoms.