Cafodd y bachgen ei arestio yn dilyn digwyddiad yn Ysgol Gyfun Aberdaugleddau ar 5 Chwefror, ac fe blediodd yn ddieuog i’r holl gyhuddiadau.
Yn ei thystiolaeth, dywedodd yr athrawes, Vicki Williams, fod y bachgen wedi ei dilyn i mewn i’w hystafell gan ofyn am help gyda’i waith hanes, cyn “hyrddio” ati gyda chyllell cegin fawr.
Roedd y bachgen, oedd yn 15 oed ar y pryd, yn mynnu nad oedd bwriad i’w thrywanu.
Dywedodd wrth y llys bod y gyllell wedi “mynd i bobman” wedi i Ms Williams weld rhywbeth yn ei fag ysgol a gorchymyn iddo i’w dynnu allan.
Bu’r ddau, meddai, yn “ymladd am ryw 10 eiliad” wrth iddo wrthod rhoi’r arf iddi, gan nad oedd eisiau mynd i drwbl am ddod â chyllell i’r ysgol.
Dywedodd na welodd y gyllell yn cyffwrdd â phen Ms Williams, ond ei fod yn derbyn fod hynny wedi digwydd.
Cafodd Ms Williams ei chludo i Ysbyty Llwynhelyg, Hwlffordd, cyn dod adref y noson honno.
Mwy i ddilyn.
Dilynwch Cymru Fyw ar Facebook, dolen allanol, X, dolen allanol, Instagram, dolen allanol neu TikTok, dolen allanol.
Anfonwch unrhyw syniadau am straeon i cymrufyw@bbc.co.uk, dolen allanol neu cysylltwch drwy WhatsApp ar 07709850033.
Lawrlwythwch yr ap am y diweddaraf o Gymru ar eich dyfais symudol.
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