A slit through the valve face of monoraphid and diraphid diatoms, usually situated along the apical axis. This is the structure which enables a diatom cell to move over substrates

In diatoms, a slit in the valve face that allows the cell to move along a substrate

(Gr. a seam): The midline plane of the midbrain, pons, or medulla oblongata.

Greek a seam; hence, the line of junction of the edges of 2 muscles or areas of skin.

a seam where two similar sheets of tissue unite.

In general, a raphe (pronounced "RAY-fee" ) is a seam. It is most commonly used when describing diatoms, seeds, and human anatomy.

A seed surface ridge found in some dicots

The part of the funiculus that is fused along the side of the ovule.