Webster's Revised Unabridged Dictionary · 1913

Pock

Pock , noun

[Old English pokke, Anglo-Saxon pocc, poc; akin to Dutch pok, German pocke, and perh. to English poke a pocket. Compare Pox.]

(Medicine) A pustule raised on the surface of the body in variolous and vaccine diseases.
Of pokkes and of scab every sore. — Chaucer