hinge

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hinge

see hinge joint.

craniofacial hinge
flexible connection between the skull bones in many birds and reptiles which permit the upper jaw to be raised at the same time as the mandible is depressed; well developed between the nasal and frontal bones in psittacine birds.
References in periodicals archive ?
The ACT2[R] Sterilization Container System features a unique, space saving split-shell design, puncture proof filter system, a clear hardcoat surface finish, a hingeless interchangeable filter retention plate, cam-lock latch, and the exclusive Tamperguard+[TM] tamper proof process device.
According to Nadel, ovals, small round frames and sports wraparounds remain popular as are hingeless and semirimless styles.
Tested at last year's Olympics, Oakley's Overthetop hingeless sunglasses are just perfect for going down the pub to see your mates - and give them a laugh
The opportunity for the EW upgrade comes with the conversion of the H-1 aircraft series from the existing two-bladed semi-rigid, teetering rotor system to a four-bladed, hingeless, bearingless rotor system.
The most high-profile pair is a futuristic wrap from Oakley that tightly fits the face and has a hingeless frame for athletes who don't like anything pinching their ears.