Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ăd-augesco, ĕre, v. inch. n. [ad, intens.], to begin to increase or augment, to grow, to thrive: neque adaugescit quidquam neque deperit inde, Lucr. 2, 296; so also Cic. poet. in Div. 1, 7 fin.