Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
cŏăcervātim, adv. [coacervatus, from coacervo], by or in heaps: offerre aliquid, App. Flor. 2, p. 347, 7; cf. Cael. Aur. Tard. 4, 3.