chemistry (branch of natural science)

(obsolete) an ancient jewel or other stone in the shape of a ring

an ancient bracelet strung with jewels or bells and worn at the elbow / a longer tube-shaped gauntlet to protect the hand during archery

circle, ring, wheel

circum-

a ring or circle shape (such as a ring for a finger, or Saturn's rings) / a hoop (such as for a barrel) / a wheel (as of a vehicle)

ring / (algebra) ring

chemistry (branch of natural science)

(chemistry) organic solvent

importance