Ne′o‐co″mi‐an (?), n. [From Neocomium, the Latin name of Neuchatel, in Switzerland, where these rocks occur.] (Geol.) A term applied to the lowest deposits of the Cretaceous or chalk formation of Europe, being the lower greensand.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.