flexible joint

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a joint that holds two parts together so that one can swing relative to the other
• Syn:
hinge
• Derivationally related forms:
hinge (for: hinge)
• Hypernyms:
joint
• Hyponyms:
butt hinge, strap hinge, joint hinge, tee hinge, T hinge
• Part Holonyms:
exterior door, outside door, swing door, swinging door, French door,
bi-fold door, car door, gate
• Part Meronyms:
pintle