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The Collaborative International Dictionary of English v.0.48:

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]