Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
augmen, ĭnis, n. [augeo], an increase, enlargement, augmentation, growth (only ante- and post-class.): corporis, Lucr. 2, 495; 3, 268: Augmine vel grandi vel parvo, id. 1, 435: augmine donare, id. 2, 73; 5, 1307: magni augminis coluber, Arn. 7, p. 249.
In plur.: Sursus enim versus gignuntur et augmina (flammarum corpora) sumunt, Lucr. 2, 188: cum sumant augmina noctes, id. 5, 681; for Arn. 7, p. 231, v. augmentum fin.