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Offeryn allweddell yw'r organ. Fel arfer, mae ganddo sawl allweddell neu lawfwrdd, ynghyd ag allweddell i'r traed. Mae'n cynhyrchu sain trwy yrru aer trwy nifer o bibennau. Yn ôl traddodiad, fe ddyfeiswyd yr organ neu hydrawlis cyntaf gan Ctesibius o Alecsandria yn y 3g cyn Crist.
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