sub·duc·tion  (səb-dŭk'shən)  n. A geologic process in which one edge of one crustal plate is forced below the edge of another. [French, from Latin subductus, past participle of subdūcere, to draw away from below : sub-, sub- + dūcere, to lead; see deuk- in Indo-European roots.] sub·duct' v., sub·duc'tal (-təl) adj. |