Delthyris

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Delthyris \Del*thy"ris\, n. [NL., fr. Gr. de`lta the name of the
     letter [Delta] + thy`ra door.] (Zool.)
     A name formerly given to certain Silurian brachiopod shells
     of the genus {Spirifer}.
     [1913 Webster]
  


     {Delthyris limestone} (Geol.), one of the divisions of the
        Upper Silurian rocks in New York.
        [1913 Webster]