any plant of the family Brassicaceae (formerly Cruciferae), having a corolla of four petals arranged like a cross and a fruit called a siliqua. The family includes the brassicas, mustard, cress, and wallflower
2.
a person who carries a cross
[C16: from Late Latin, from Latin crux cross + ferre to carry]
1650s, from L.L. crucifer "cross-bearing," from L. crux (gen. crucis) "stake, cross." Originally in literal senses; botanical use (in ref. to a symmetrical arrangement of four petals) is from 1851.