Source : Webster's Revised Unabridged Dictionary (1913)

Ecthyma \Ec*thy"ma\, n.; pl. {Ecthymata}. [NL., fr. Gr. ?
   pimple, fr. ? to break out.] (Med.)
   A cutaneous eruption, consisting of large, round pustules,
   upon an indurated and inflamed base. --Dunglison.