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Definition: Two offspring born of the same pregnancy and developed from two ova that were released from the ovary simultaneously and fertilized at the same time. They may be of the same or opposite sex, differ both physically and genetically, and have two separate and distinct placentas and membranes, both amnion and chorion.
Context: Gwelwyd cynnydd sylweddol yn y nifer o achosion o efeilliaid monosygotig (unwy/un ffunud) sy'n cydgordio i drawsnewid o'u cymharu â gefeilliaid deusygotig (deuwy).
Notes: Mae’r term fraternal twins / gefeilliaid deuwy yn gyfystyr.
Definition: Cynrychioliad rhithiol o endid neu system ffisegol yn y byd go iawn, sy'n gwbl annibynnol ac yn gallu dysgu gan yr endid neu system ffisegol gyfatebol. Gellir ei ddefnyddio i wella perfformiad y system ffisegol neu i rag-weld ac atal problemau cyn iddynt ddigwydd.
Notes: Mae'r term hwn yn rhan o gyfres o dri term cysylltiedig sy'n adlewyrchu lefelau gwahanol o gymhlethdod yn y systemau rhithiol: digital model (model digidol), digital shadow (cysgod digidol) a digital twin (gefell digidol).
