Etymology
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subduction (n.)

early 15c., "withdrawal, removal" (originally of noxious substances from the body), from Latin subductionem (nominative subductio) "a withdrawal, drawing up, hauling ashore," noun of action from past participle stem of subducere "to draw away, take away" (see subduce). Geological sense is attested from 1970, from French (1951).

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Definitions of subduction

subduction (n.)
a geological process in which one edge of a crustal plate is forced sideways and downward into the mantle below another plate;
From wordnet.princeton.edu