Definify.com

Webster 1913 Edition

Noun.

[F.

mort-mai

a deadly evil.

Nares

A bad sore; a gangrene; a cancer.

[Obs.]

[Written also

morrimal

and

mortmal

Chaucer.

mormal ‎(plural mormals)

(obsolete) A bad sore; a gangrene or cancer.
- 14th C., Geoffrey Chaucer, The Canterbury Tales, "General Prologue", lines 387-388:
  But greet harm was it, as it thoughte me, / That on his shyne a mormal hadde he.
  But very ill it was, it seemed to me, / That on his shin a deadly sore had he.