extensor

As a noun extensor

is (anatomy) a muscle whose contraction extends or straightens a limb or body part.

As an adjective antagonistic is

contending or acting against; as, antagonistic forces.

In anatomy|lang=en terms the difference between protractor and extensor

is that protractor is (anatomy) a muscle that extends an organ or part; opposed to retractor while extensor is (anatomy) a muscle whose contraction extends or straightens a limb or body part.

As nouns the difference between protractor and extensor

is that protractor is one who, or that which, protracts, or causes protraction while extensor is (anatomy) a muscle whose contraction extends or straightens a limb or body part.

In anatomy terms the difference between abductor and extensor

is that abductor is a muscle which serves to draw a part out, or from the median line of the body; as, the abductor oculi, which draws the eye outward while extensor is a muscle whose contraction extends or straightens a limb or body part.

As nouns the difference between abductor and extensor

is that abductor is one who abducts; a kidnapper while extensor is a muscle whose contraction extends or straightens a limb or body part.

As a noun extensor is

(anatomy) a muscle whose contraction extends or straightens a limb or body part.

In anatomy terms the difference between adductor and extensor

is that adductor is a muscle which draws a limb or part of the body toward the middle line of the body, or closes extended parts of the body; -- opposed to abductor; as, the adductor of the eye, which turns the eye toward the nose while extensor is a muscle whose contraction extends or straightens a limb or body part.