STY

I. noun (plural sties; also ~es) Etymology: Middle English, from Old English stig pen; pigpen; akin to Old Norse svīnsti pigpen Date: before 12th century pigpen , II. verb (stied or ~ed; ~ing) Date: before 12th century transitive verb to lodge or keep in a ~, intransitive verb to live in a ~, III. noun or ~e (plural sties or ~es) see: stair Date: 1617 an inflamed swelling of a sebaceous gland at the margin of an eyelid