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Definition: Yng nghyd-destun awtistiaeth, ymdeimlad o drallod aruthrol a achosir gan effeithiau cyfun straen, gorflinder, diffyg diogelwch, ymdeimlad o berygl, anghenion nas diwallwyd, a/neu ormodedd o wybodaeth, sŵn, golau, arogleuon neu gyffyrddiadau.
