Del*thy"ris (?), n. [NL., fr. Gr. de`lta the name of the letter thy`ra door.] Zool.

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 1913.

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