Linch″pin′ (lĭnch″pĭn′), n. [AS. lynis the axletree; akin to D. luns linchpin, OS. lunisa, LG. lunse, G. lünse, OHG. lun peg, bolt.] A pin used to prevent the wheel of a vehicle from sliding off the axletree.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.