Source : Webster's Revised Unabridged Dictionary (1913)

Matrass \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.