Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
offulcĭo (obf-) (si), tum, 4, v. a. [ob-fulcio], to stop up (Appul.): vulnus spongiā offulciens, App. M. 1, p. 108, 17: multis laciniis offulto vulnere, id. ib. 4, p. 147, 14.