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 the Appendix of Indo-European roots.]
sub·ductal (-təl) adj.
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Indo-European & Semitic Roots Appendices
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