Ma‐trass″ (?), n. [F. matras; perh. so called from its long narrow neck; cf. OF. matras large arrow, L. materis, mataris, matara, a Celtic javelin, pike; of Celtic origin.] (Chem.) A round-bottomed glass flask having a long neck; a bolthead.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.