Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† ădĭantum, i, n., = ἀδίαντον, the plant maiden-hair, Plin. 22, 21, 30, § 62 (pure Lat.: capillus Veneris or capillaris herba, App. H. 47; Cael. Aurel. Tard. 3, 5).