Ham´il`ton pe´ri`od(hăm´ĭl`tŭn pē´rĭ`ŭd)
|1.||(Geol.) A subdivision of the Devonian system of America; - so named from Hamilton, Madison Co., New York. It includes the Marcellus, Hamilton, and Genesee epochs or groups. See the Chart of Geology.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.