We don't have synonyms for assident yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are accident, dissident and resident.
(adj) :
(medicine) Of a symptom, generally, but not always, accompanying a disease; indicative of the presence of a disease but not a necessary occurrence in conjunction with that disease.
(adj) :
(medicine) Of a symptom, generally, but not always, accompanying a disease; indicative of the presence of a disease but not a necessary occurrence in conjunction with that disease.