屈

servile submission; subservience

to bow (of one's back, e.g. due to age); to bend

refractive index

quibbler

quibble; pointless argument

hollow of the knee

Anatomy

flexor (muscle)

retroflexion

Civil engineering

buckling

elasticity

double refraction; birefringence

angle of refraction

dorsiflexion; dorsal flexion

Viennese oyster (sexual position)

elbow; elbow-shaped bend

wolverine (Gulo gulo); glutton; carcajou

tropism

refractometer

Medicine

bowed tendon

phototropism

geotropism

Linguistics

inflected language; fusional language

axis of refraction

flexibility; bend-tolerance