chicken pock
/ˈtʃɪk(ɪ)n ˌpɒk/noun
An individual lesion of the rash of the disease chickenpox, consisting of a superficial vesicle. Also (in plural and formerly also in singular): the disease itself (now rare ).
Origin
Mid 18th century; earliest use found in Daniel Turner (1667–1741), surgeon and physician. From chicken + pock, after chickenpox.