(formal) Female third-person singular pronoun; she, her, girlfriend

(colloquial) a girlfriend (a female partner in a romantic relationship)

(literary) they (about women or girls)

circle, ring, wheel

ring / (algebra) ring

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)

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

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

a wedding ring