Chweched lythyren ar hugain, a'r olaf, yr wyddor Ladin yw Z (z).
Ni cheir Z yn yr wyddor Gymraeg draddodiadol ac eithrio mewn tri o eiriau benthyg sy'n deillio o enw'r diwinydd Swisaidd Ulrich Zwingli, e.e. Zwinglïad (dilynwr Zwingli), sy'n dyddio o 1845.
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