flexure

Concise Oxford English Dictionary © 2008 Oxford University Press:
flexure /ˈflɛkʃə/

▶noun chiefly Anatomy & Geology

• 1 the action of bending or curving, or the condition of being bent or curved.

• 2 a bent or curved part.

– derivatives
flexural adjective.

– origin C16: from L. flexura, from flectere ‘to bend’.