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-osis

process, condition (often abnormal)

Greek · -osis (-ωσις)

Greek -osis marks a process or condition, often a medical one. Attach it to a stem: diagnosis (a process of knowing through), hypnosis (the sleep-like state), metamorphosis (the process of changing shape).

Memory trick

Think "O, SIS!": a sister in a hospital reporting a condition or process.

Words from this root