Webster's Revised Unabridged Dictionary · 1913

Tumefy

Tumefy (tū"me*fī) , transitive verb

[French tuméfier, from Latin tumere to swell + -ficare (in comp.) to make; compare Latin tumefacere to tumefy. See Tumid, and -fy.]

To swell; to cause to swell, or puff up.
To swell, tumefy, stiffen, not the diction only, but the tenor of the thought. — De Quincey

Tumefy , intransitive verb

To rise in a tumor; to swell.