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Definition: Cyflwr o flinder a diffyg egni corfforol a/neu feddyliol sylweddol, a all fod yn ganlyniad straen, meddyginiaeth, gorweithio, salwch neu anhwylder.
Notes: Mae tuedd i exhaustion/gorflinder gyfeirio at gyflwr byrdymor, ac i fatigue/lludded gyfeirio at gyflwr hirdymor, ond cânt eu trin fel cyfystyron yn aml.
