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(gäp), city (1990 pop. 35,647), capital of Hautes-Alpes dept., SE France, on the Luye River at the foot of the Dauphiné Alps. A center for tourism, Gap is an agricultural market that manufactures clothing, wood products, and construction materials. Founded by Augustus c.14 B.C., it was the capital of medieval Gapençais, which was annexed to the crown of France in 1512. The city was devastated during the Wars of Religion (16th cent.).


A region not adequately covered by the main lobes of a radar antenna.
(computer science)
A uniformly magnetized area in a magnetic storage device (tape, disk), used to indicate the end of an area containing information.
The spacing between two electric contacts.
A break in a closed magnetic circuit, containing only air or filled with a nonmagnetic material.
A short region that is missing in one strand of a double-stranded deoxyribonucleic acid.
Any sharp, deep notch in a mountain ridge or between hills.
An opening at the point of closest approach between faces of members in a weld joint.


An opening, as in a wall; an open joint.


i. Any space where the imagery fails to meet the minimum coverage requirements. This might be a space not covered by imagery or one where the minimum specified overlap was not obtained.
ii. Breaks in continuous radar coverage. See gap-filler radar.


1. a break in a line of hills or mountains affording a route through
2. Chiefly US a gorge or ravine
3. Electronics
a. a break in a magnetic circuit that increases the inductance and saturation point of the circuit
b. See spark gap


(mathematics, tool)
Groups Algorithms and Programming.

A system for symbolic mathematics for computational discrete algebra, especially group theory, by Johannes Meier, Alice Niemeyer, Werner Nickel, and Martin Schonert of Aachen. GAP was designed in 1986 and implemented 1987. Version 2.4 was released in 1988 and version 3.1 in 1992.

Sun version.

["GAP 3.3 Manual, M. Schonert et al, Lehrstuhl D Math, RWTH Aachen, 1993].


(1) The space between blocks of data on magnetic tape.

(2) The space in a read/write head over which magnetic flux (energy) flows causing the underlying magnetic tape or disk surface to become magnetized in the corresponding direction.
References in periodicals archive ?
Results indicates that significant changes occurred in both the hearing levels and air-bone gaps in both timing and frequency after the active treatment period.
n=50) Type of procedure Parameters After stapedotomy After stapedectomy Air-bone gap [less than 88% 64% or equal to]10 dB Air-bone gap [less than 8% 16% or equal to]20 dB Recurrent conductive 4% 12% hearing loss Complete hearing loss 0% 4% Reparative granuloma 0% 4% Perilymph fistula 0% 4% Facial palsy 0% 0% Tympanic membrane 0% 0% perforation
For the statistical comparison of the air-bone gap between the myringostapediopexy and the CLE, the Student t test was used.
8 dB Author Comment Kazikdas et al, No significant differences (3) 2007 Yetiser and The air-bone gap was Hidir, (4) 2009 significantly better in the cartilage group Cabra and Monux, Morphologic success rates: (2) 2010 cartilage 82.
Remaining air-bone gap 10 dB or less Excellent Remaining air-bone gap 11-20 Db Good Air-bone gap persisting at pre-operative Level or insignificant rise Poor Deterioration of hearing Worse
Out of 20 patients who had undergone tympanoplasty with cortical mastoid bone after canal wall down mastoidectomy, the mean pre-operative air-bone gap was 39.
Comparison of the preoperative and postoperative pure tone averages in speech frequencies and the air-bone gap gives a complete picture of the improvement in hearing after surgery and also establishes a baseline for any changes (Improvement/deterioration) which may occur as a result of treatment or due to natural progression of disease.
On postoperative day 9, the patient experienced improvement in the right ear, with significant closure of the air-bone gap (figure 2, B).
20 db air-bone gap (Mean pre-operative and post -operatively air-bone gap: 35.
Pure-tone audiometry showed a reduction in the air-bone gap with a slight deterioration of bone conduction and an improvement in the air-conduction threshold.
This study was undertaken with a view to evaluate the results of type I tympanoplasty with and without cortical mastoidectomy in terms of closure of air-bone gap and graft uptake in cases of inactive mucosal type of CSOM.