The new formation over the end of a cutting, before it puts out rootlets.
A shining area on the frons of many species of Tabanomorpha (horse flies and relatives).
The material of repair in fractures of bone; a substance exuded at the site of fracture, which is at first soft or cartilaginous in consistency, but is ultimately converted into true bone and unites the fragments into a single piece.
A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use.
To form such hardened tissue.
A trench cut in the soil, as when plowed in order to plant a crop.
Any trench, channel, or groove, as in wood or metal.
A deep wrinkle in the skin of the face, especially on the forehead.
To cut one or more grooves in (the ground, etc.).
To wrinkle.
To pull one's brows or eyebrows together due to concentration, worry, etc.