Meanings

tetrahedron

four-wheel drive

shoulder pain occurring in one's 40s

four-armed scoop net

a fourth

quadrangular prism

fourfold

the Four Books (Confucian texts)

looking everywhere

four-part harmony

string quartet

rectangle

hold in which both wrestlers obtain an underarm grip with the right hand and an overarm grip with the left

to be square

hold in which both wrestlers obtain an underarm grip with the left hand and an over-arm grip with the right

periphery

the four Hindu castes

foursome

pentatonic scale

four corners