Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word pyrio could not be parsed. Trying a normal dictionary lookup:
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Pyrĭphlĕgĕthon, ontis, m., = Πυριφλεγέθων, a river in the Infernal Regions, usually called Phlegethon, Cic. N. D. 3, 17, 43 dub.; Tert. Apol. 47 fin.; Arn. 2, 52.
† pyrītes, ae, m., = πυρίτης.
† pyrītis, ĭdis, f., = πυρῖτις, a precious stone of a black color, otherwise unknown, Plin. 37, 11, 73, § 189.