(phonology) A phonemic merger where the vowels in pin and pen are pronounced the same before /n/ and /m/, making pin and pen homonyms.

(zoology) The caudal plate of trilobites, crustacea, and certain insects.

plural of spoiler effect

One of 102 counties in Illinois, United States. County seat: Aledo. Named after Hugh Mercer. / One of 120 counties in Kentucky, United States. County seat: Harrodsburg. Named after Hugh Mercer.