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 trigla could not be parsed. Trying a normal dictionary lookup:
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† triglītis, is,f., = τριγλῖτις, a precious stone, otherwise unknown, Plin. 37, 11, 72, § 187.
† trīglyphus, i, m., = τρίγλυφος; in archit., an ornament in the frieze of the Doric order, a triglyph, Vitr. 4, 2 med.