WordReference Random House Unabridged Dictionary of American English © 2026
mor•tif•er•ous
(môr tif′ər əs),USA pronunciation adj.
mor•tif′er•ous•ness, n.
- deadly;
fatal.
- Latin mortiferus death-bearing, equivalent. to morti- (stem of mors) death + -ferus -ferous
- 1525–35