Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
circum-lăvo, āre and ĕre, v a., lit. to wash around, hence, of waters, to overflow all around (only in the foll. exs.): Aegyptus, quam Nilus circumlavat, Hyg. Fab 275: insula superjactis fluctibus circumlavitur, Sall. ap Non. p. 504, 1 (id. H. 2, 83 Dietsch).