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lock

 [lok]
1. a place, often airtight, where something is sealed in.
2. a device such as a clamp for holding something firmly in place.
heparin lock see heparin lock.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

lock

(lok),
A device for holding or closing.
Farlex Partner Medical Dictionary © Farlex 2012

lock

Vox populi A device that prevents a particular action or activity. See Bloxham air lock, Heparin lock, Job lock, Vapor lock.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

lock

(lok)
1. An enclosing, fastening, or securing device.
2. A mechanism that, when moved, permits or obstructs passage.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in classic literature ?
It was shut and locked, and the man fell down in a swoon.
"We'll be through the next lock before seven, and then there is only one more;" and I settled down and pulled steadily away.
We passed the bridge, and soon after that I asked if she saw the lock. She said no, she did not see any lock; and I said, "Oh!" and pulled on.
Boxtel, who saw all this whilst hiding himself on the landing-place of the staircase above, descended step by step from his story as Rosa descended from hers; so that, when she touched with her light foot the lowest step of the staircase, Boxtel touched with a still lighter hand the lock of Rosa's chamber.
They were all locked. A glance about the chamber revealed a wooden table and a bench.
He slowly revolved in his mind the incidents of the evening--the open, unguarded gate; the lighted doorway--the only one he had seen thus open and lighted along the avenue he had followed; the advance of the warriors at precisely the moment that he could find no other avenue of escape or concealment; the corridors and chambers that led past many locked doors to this underground prison leaving no other path for him to pursue.
Upon this, she unlocked the door, and, passing out, closed it again softly; leaving it to all appearance (when viewed on the inner side) as carefully secured as Agnes had seen it when she tried the key in the lock with her own hand.
'Don't forget to lock the other door there, in the dressing-room.'
It didn't matter when he locked his door again the last thing at night.
Up in his bedroom I kept on repeating it in my own mind--with my eyes all the while on the key, which he had moved to the inner side of the door to lock himself in--till the knowledge of what it meant burst on me like a flash of light.
Never mind the rumpus upstairs--there's nobody outside to help them; and the gate's locked, if there was."
"What does that prove?" I rejoined with a good sense of which I was proud; "he might have opened the lock with his left hand, which would have been quite natural, his right hand being wounded."