تعادى doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• تعادى Form 6

  6 تعادى القَوْمُ ذ The people, or party, became affected, [or infected,] or smitten, (S, TA,) one with the disease of another, or one with the like of the disease of another: (S:) or died, one after another, (S, TA,) in …

  View in Lane's Lexicon →