Any compact body of troops forming a battle array or phalanx, especially such a body of Scottish troops armed with pikes during the Wars of Scottish Independence in the late 13th and early 14th centuries.
Origin
From Middle English scheltroun, sheltroun, from Old English sċieldtruma, from sċield (ultimately from Proto-Indo-European *(s)kelH-) + truma (possibly from trum, ultimately from Proto-Indo-European *drew-, *dóru).
Modern English dictionary
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