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 periodicals archive ?
Although DES is not traditionally thought to be associated with LES dysfunction on barium studies, (17,39) recent literature suggests that the majority of patients with DES have impaired LES opening on barium studies with the tapered, beaklike distal esophageal narrowing that is typically associated with achalasia (Figure 10).
The common dismissal - "mild tease" - tacked on at the end is thus hybridized by the other, rather sinister world of the fairy tale experience, as well as by the accompanying sketch of a girl with an angrily drawn, beaklike brow and hand over her heart.
8 mm) (measured from sections); beaklike anterior end, ambiguous in Figure 1 (from Hubrecht, 1888), although unambiguous in outline sketch of No.
Some possess a beaklike sharpness (aligning their characters with the crows that make regular appearances in these books), while others are as blocky as ice cubes--not surprising, given that Lemire's stories are set in Southern Ontario and feature men and boys who love hockey.
Clifton Taylor's vivid lighting flashes streaks of sunlight through clouds, and birdlike costumes by Willa Kim--rich russet, green, and blue bodysuits with feathery trim and beaklike visors--reinforce the dance's intriguing blend of animal instinct and human nature.
Because the beak joint of cephalopods represents the only muscle articulation examined thus far, the goal of this study is to begin to identify the general principles of support and movement in these joints by examining an example from another organism, a predatory schizorhynch kalyptorhynch flatworm with two beaklike hooks mounted on an anterior, eversible, and muscular proboscis.