| delthyris | <zoology> A name formerly given to certain Silurian brachiopod shells of the genus Spirifer. <geology> Delthyris limestone, one of the divisions of the Upper Silurian rocks in new York. Origin: NL, fr. Gr. Delta the name of the letter <DELTA/ + thyra door. Source: Websters Dictionary (01 Mar 1998) |
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