INCIS'ION, noun s as z. [Latin incisio, from incido, to cut.] 1. A cutting; the act of cutting into a substance. 2. A cut; a gash; the separation of the surface of any substance made by a sharp instrument. The surgeon with his knife makes an incision in the flesh, and the gardener, in a tree; but we do not say, an incision is made with a plow or a spade; at least such phraseology is unusual. 3. Separation of viscid matter by medicines.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI