He died of 'natural causes'. [=he died because he was ill or old and not by being killed in an accident, battle, etc.]
She was adopted immediately after she was born and never knew her 'natural' [=(more commonly) 'birth'] parents.
a country rich in 'natural resources' [=a country that has many valuable plants, animals, minerals, etc.]
(..) and,and,I find that when I'm undergoing stress, that good food and company can have a comforting effect. Also, curry is a natural laxative, and I don't have to tell you, that,you know,a clean colon is just one less thing to worry about. Leonard,I'm no expert here, but I believe (..)2007 TvShow: The Big Bang Theory Title: Pilot Season: 1 Episode 1