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Matrass
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.
matrassBolthead Bolt"head`, n.
1. (Chem.) A long, straight-necked, glass vessel for chemical
distillations; -- called also a matrass or receiver.
2. The head of a bolt.
Meaning of matrass from wikipedia