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: Læ Lé L- L. La Lb Lc Ld Le Lf Lg Lh Li Lj Ll Lm Lo Lp Lr Ls Lt Lu Lv Lw Lx Ly

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linchpin

Noun

linch=pin

WORDNET DICTIONARY

linchpin(n = noun.cognition) anchor, backbone, keystone, lynchpin, mainstay - a central cohesive source of support and stability; "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm"

is a kind of support

linchpin(n = noun.artifact) lynchpin - pin inserted through an axletree to hold a wheel on; Array

is a kind of pin

linchpin, 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. [1913 Webster]

linchpin, n.
1 a pin passed through an axle-end to keep a wheel in position.
2 a person or thing vital to an enterprise, organization, etc.

Etymology

ME linch f. OE lynis + PIN

For further exploring for "linchpin" in Webster Dictionary Online