"In over nine out of every ten people there is no definite cause of
high blood pressure. This condition is known as 'essential
hypertension'."
A oes rhywun yn gwybod a oes term Cymraeg? O edrych yn
dictionary.com, mae i "essential" yn y cyd-destun hwn ei ddiffiniad ei hunan
- h.y. dyw e ddim yr un peth ā "hanfodol"
etc.
Diolch Siān
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