Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† ammi (ami) and ammium (ami-um), ii, n., = ἄμμι and ἄμμιον, ammi, an umbelliferous plant: est cumino simillimum quod Graeei vocant ami, Plin. 20, 15, 58, § 163; 20, 24, 100, § 264 Jan. (al. ammium): ammium, Scrib. Comp. 121 ext.