Keystoner

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A member of the 28th Infantry Division (United States). US

Etymology

From keystone + -er, after the "Keystone State" (Pennsylvania) from whose National Guard it originated.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.