English: variations of sex characteristics
Welsh: amrywiadau nodweddion rhyw
Subject: Iechyd
Welsh definition: Grŵp o gyflyrau prin sy'n ymwneud â genynnau, hormonau ac organau atgenhedlu, a all olygu bod person yn datblygu'n wahanol i'r rhan fwyaf o bobl.
English context: Intersex and VSC: An intersex person is someone who does not fit conventional expectations for male or female development in terms of anatomy, metabolism or genetics. The opposite of intersex is endosex, which is where a person does fit conventional expectations. Some clinicians use the term differences in sex development (DSD), but this term is unpopular among intersex groups as it is connected to the former meaning of DSD as “disorders of sex development”. The term “disorder” is felt to be pejorative. Similarly, the term intersex is sometimes rejected by some groups and may prefer to refer to “Variations of Sex Characteristics” (VSC) or “variations in reproductive or sex anatomy”. 
Notes: Term arall am 'wahaniaethau datblygiad rhyw' / 'differences in sex development', ac a elwir weithiau'n 'anhwylderau datblygiad rhyw' / 'disorders of sex development'. Gall gynnwys bod yn 'rhyngryw' / 'intersex'.