Etymology
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armchair (n.)

also arm-chair, "chair with rests for the elbows," 1630s, from arm (n.1) + chair (n.). Another old name for it was elbow-chair (1650s). Adjectival sense, in reference to "criticism of matters in which the critic takes no active part," is from 1886.

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Definitions of armchair

armchair (n.)
chair with a support on each side for arms;
From wordnet.princeton.edu