beak

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beak

(bēk),
1. The nose of pliers used in dentistry for contouring and adjusting wrought or cast metal dental appliances.
2. Sometimes used to describe a beak-shaped anatomic structure.
[L. beccus]

beak

(bēk)
n.
a. The bill of a bird, especially one that is strong and curved, such as that of a hawk or a finch.
b. A similar structure in other animals, such as turtles, insects, or fish.

beaked (bēkt) adj.

beak

1 any pointed anatomical structure, such as the beak of the sphenoid bone.
2 a pair of dental pincers used in shaping prostheses.
3 a radiographic image of a bony protuberance adjacent to a degenerative intervertebral disk.

beak

  1. (also called bill) the jaws and associated horny covering in a bird or turtle.
  2. any pointed projection in plant fruits.
  3. a projecting jawbone in fish such as pike.
  4. the tip of the UMBO in bivalve molluscs.
  5. the jaws of a CEPHALOPOD such as the octopus.

beak

(bēk)
1. Nose of pliers used in dentistry to contour and adjust wrought or cast metal dental appliances.
2. Sometimes used to describe any beak-shaped anatomic structure.
[L. beccus]

beak

the hard keratinization (or rhamphotheca) which provides the horny covering of the beak bones, plus the beak bones, of birds. The dorsal ridge of the upper beak is the culmen, the similar keel of the lower beak is the gonys. The cutting edges of the beak are the tomia. Called also bill.
Enlarge picture
Different shape of beak between species. By permission from Aspinall V, O'Reilly M, Introduction to Veterinary Anatomy and Physiology, Butterworth Heinemann, 2004

beak avulsion
traumatic separation of the upper and lower beak at the base requires hand feeding for survival of the bird. Some attempts at devising an artificial beak have been made, but attachment is a major problem.
beak fracture
occurs with trauma and requires immobilization, often with innovative procedures (see acrylic glue), without restricting food intake by the bird during recovery. Severe trauma may result in avulsion of upper or lower beak.
beak necrosis
a condition of chickens and turkeys caused by excessively fine mashed feeds.
beak overgrowth
can result from malocclusion, liver disease, lack of wear, aging, nutritional deficiency, and most commonly infestation by the mite, Cnemidocoptes pilae.
psittacine beak and feather disease
see psittacine beak and feather disease.
beak sign
the radiographic feature of contrast material extending through an elongated, concentrically narrowed pylorus indicative of hypertrophy of the sphincter.
beak trimming
in most modern poultry houses the chances of cannibalism developing are so high that beak trimming is almost a necessity, especially if the birds are to be reared in full light. Light-restricted accommodation greatly reduces the prevalence of this vice. A temporary trim is done at a few days of age but a permanent trim is necessary later. Special instruments, utilizing a hot, cutting blade cautery, are used and the operation must be done by an expert or badly deformed beaks result and the birds are unable to feed properly. Alternatives to trimming include the fitting of spectacles or pick guards but these are expensive, time-consuming to put on and not feasible for birds in cages.
References in classic literature ?
All are very good eating," said the Adjutant, clattering his beak.
I was young then," said the Adjutant, clattering his beak significantly.
No one is all happy from his beak to his tail," said the Adjutant sympathetically.
And there was that lean old fellow with the eagle beak that had dropped in on us one night.
When I come to, there was Vahna spread-eagled on top of the nugget, and the old fellow with a beak jabbering away solemnly as if going through some sort of religious exercises.
Well, I just sat there looking at the chip in the moonlight, and turning it over and over and figuring what it was and where it'd come from, when all of a sudden there was a snap inside my head as if something had broken, and then I could see Vahna spread-eagled on that big nugget and the old fellow with the beak waving the stone knife, and .
With your strong beak, break the knot which holds him tied, take him down, and lay him softly on the grass at the foot of the oak.
Insects such as bedbugs, fleas, and mosquitoes poke through your skin with their drill-like beaks.
Keays and colleagues looked for these cells in about 250,000 thin slices of tissue from beaks of almost 200 pigeons collected across Europe.
In Alaska we have documented 2,160 black-capped chickadees (Poecile atricapillus) and 435 individuals of 29 other species of birds, primarily during the past decade, with grossly overgrown and often crossed beaks.
Zanno explained that important traits associated with herbivory are tooth loss, beaks, different tooth shapes (leaf, peg conical), multiple tooth types in one animal, tooth elongation (including rodent-like incisors), and long necks.
A new study suggests that the birds' huge, hooked beaks functioned like axes to kill prey with a single blow.