longitudinal edge

Frontal sutures are distinct, longitudinal edges are sharply defined.

The outer ends of these girders were connected with a backbone girder, which formed the outer longitudinal edge of the fin.

When employing the miter joint to connect two pieces that have a non-circular cross-section it is typically desirable to have the longitudinal edges of the joined pieces match up properly at the joint.

The best approach is to split the laser beam into two beams of light, which are reflected by the top-edge of the sample and by the top-edge of the sample holder, or by both longitudinal edges of the specimen.

Using the definition of "knife" in the Oxford English Dictionary ("A cutting instrument consisting of a blade with a sharpened longitudinal edge fixed in a handle either rigidly, as in a table knife, carving or sheath knife, or with a joint, as in a pocket or clasp knife.