ˈdipˌtōt noun
( plural dip·totes -ōts ; or dip·to·ta dipˈtōd.ə)
Etymology: Late Latin diptoton noun with only two cases, from Greek diptōton, neuter of diptōtos having one form for two cases, from di- + -ptōtos (from piptein to fall, influenced in meaning by Greek ptōsis case) — more at symptom
: a noun or adjective with only two cases