Tec‐ton″ic (?), a. 1. (Biol.) Structural.
2. (Geol. & Phys. Geog.) Of, pert. to, or designating, the rock structures and external forms resulting from the deformation of the earth's crust; as, tectonic arches or valleys.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.