Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
inter-nascor, nātus, 3, v. dep., to grow between or among: internascentes herbae, Plin. 18, 16, 43, § 146: virgulta internata, Liv. 28, 2: internatum corpus, Plin. 17, 27, 42, § 251.