圓

circle / round / circular / spherical / (of the moon) full / unit of Chinese currency (yuan) / tactful / to make consistent and whole (the narrative of a dream or a lie)

person / employee / member

enclosure

circle

(math.) the ratio of the circumference of a circle to its diameter (π)

to mediate / to broker a compromise

circumference

semicircle

semicircular

protractor

oval / ellipse

without rules, nothing can be done (idiom, from Mencius); one must follow some rules

oval / ellipsoidal

oval window between middle and inner ear

coaxial circular arc / concentric arc (in spherical geometry)

radiance emanating from the head / halo

the trigonometric functions

cyclostome (marine biology)

inflexible / unaccommodating

hexagon socket head cap screw

to counter (a stroke in fencing)

virtuous achievements come to their successful conclusion (idiom)

to buy the whole lot / to take everything remaining