Definition of Delthiris

Definition of Delthiris

||Del*thy"ris (?), n. [NL., fr. Gr. de`lta the name of the letter &DELTA; + thy`ra door.] (Zoöl.) 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 Unabridged Dictionary (1913)

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