Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
inter-trīgo, ĭnis, f. [tero], a chafing, fretting, or galling of the skin in riding, walking, etc., Varr. L. L. 5, § 176 Müll.: intertrigines, Plin. 20, 14, 53, § 151.