cowpox

n [U] mild contagious disease of cattle caused by a virus (which is also used in making smallpox vaccine) 牛痘.

covetousness, covey, cow, cow shed, cow-pat, coward, cowardice, cowardly, cowbell, cowboy, cowcatcher, cower, cowgirl, cowhand, cowherd, cowhide, cowl, cowlick, cowling, cowman, cowrie, cowshed, cowslip, cox, coxcomb, coxswain, Coy, coyly, coyness, coyote, coypu, cozen, cozy, CP, cps, crab, crab-apple, crab-louse, crabbed, crabby,