Which prefix means 'within'?

Which prefix means 'within'?

• A. ENDO-
• B. EU-
• C. EX, EXTRA
• D. HYPER-

Answer: (A)

Endo- means within. It comes from a Greek root meaning inside, and it’s used in many medical terms to denote something occurring inside a body part or cavity—like endoscopy (viewing inside the body), endometrium (the lining inside the uterus), or endocardium (the inner lining of the heart). The other prefixes don’t convey “within”: eu- means good or well; ex- and extra- mean outside or beyond; hyper- means above or excessive. So endo- is the one that specifically indicates inside or within.

Endo- means within. It comes from a Greek root meaning inside, and it’s used in many medical terms to denote something occurring inside a body part or cavity—like endoscopy (viewing inside the body), endometrium (the lining inside the uterus), or endocardium (the inner lining of the heart). The other prefixes don’t convey “within”: eu- means good or well; ex- and extra- mean outside or beyond; hyper- means above or excessive. So endo- is the one that specifically indicates inside or within.