Delthyris

Delthyris

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

Delthyris limestone (Geol.), one of the divisions of the Upper Silurian rocks in New York.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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