| phonetics | 1. <study> The doctrine or science of sounds; especially those of the human voice; phonology. 2. The art of representing vocal sounds by signs and written characters. Source: Websters Dictionary (01 Mar 1998) |
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| phoniatrics | The study of speech habits; the science of speech. Origin: phon-+ G. Iatrikos, of the healing art (05 Mar 2000) |
| phonic | Relating to sound or to the voice. See: phonetic. (05 Mar 2000) |
| phonic spasm | A spasmodic contraction of the intrinsic muscles of the larynx excited by attempted phonation, producing either adductor or abductor subtypes caused by central nervous system disease. A localised form of movement disorder. Synonym: phonic spasm, spastic dysphonia. (05 Mar 2000) |
| phono | 1. <prefix> A combining form meaning from sound, speech, voice, tone, such as, phonograph, phonology. 2. <entomology> A South American butterfly (Ithonia phono) having nearly transparent wings. Source: Websters Dictionary (21 Jun 2000) |
| phonoangiography | <cardiology> Recording and analysis of the audible frequency-intensity components of the bruit of turbulent arterial blood flow through a stenotic lesion. Origin: phono-+ G. Angeion, vessel, + grapho, to write (05 Mar 2000) |
| phonocardiogram | <cardiology> A record of the heart sounds made by means of a phonocardiograph. (05 Mar 2000) |
| phonocardiograph | <apparatus> An instrument, utilizing microphones, amplifiers, and filters, for graphically recording the heart sounds, which are displayed on an oscilloscope or analog tracing. Linear phonocardiograph, a phonocardiograph that records all chest wall vibrations resulting from cardiac activity, with emphasis on low frequency vibrations due to its filter characteristics. Logarithmic phonocardiograph, a phonocardiograph that records only theoretically audible vibrations with emphasis on the higher frequencies due to filter characteristics designed to imitate the logarithmic frequency-intensity response of the human auditory apparatus. Spectral phonocardiograph, an instrument for recording the heart sounds in which the electrical changes created by the latter pass from a microphone through a series of filters, each of which is tuned to a particular frequency band; output from each filter activates a separate light source of brightness proportional to the intensity of the sound transmitted through that filter; the lights are arranged vertically in descending order of frequencies. A record is obtained by photographing the vertical row of lights. Stethoscopic phonocardiograph, a phonocardiograph that records all sound vibrations, audible and inaudible, conveyed by the stethoscope; however, very low frequency vibrations (in the range of body movements) are filtered out. (05 Mar 2000) |
| phonocardiography | Graphic registration of the heart sounds picked up as vibrations and transformed by a piezoelectric crystal microphone into a varying electrical output according to the stresses imposed by the sound waves. The electrical output is amplified by a stethograph amplifier and recorded by a device incorporated into the electrocardiograph or by a multichannel recording machine. (12 Dec 1998) |
| phonocatheter | A cardiac catheter with diminutive microphone housed in its tip, for recording sounds and murmurs from within the heart and great vessels. (05 Mar 2000) |
| phonogram | 1. A letter, character, or mark used to represent a particular sound. "Phonograms are of three kinds: (1) Verbal signs, which stand for entire words; (2) Syllabic signs, which stand for the articulations of which words are composed; (3) Alphabetic signs, or letters, which represent the elementary sounds into which the syllable can be resolved." (I. Taylor (The Alphabet)) 2. A record of sounds made by a phonograph. Origin: Phono- + -gram. Source: Websters Dictionary (01 Mar 1998) |
| phonograph | 1. A character or symbol used to represent a sound, especially. One used in phonography. 2. <physics> An instrument for the mechanical registration and reproduction of audible sounds, as articulate speech, etc. It consists of a rotating cylinder or disk covered with some material easily indented, as tinfoil, wax, paraffin, etc, above which is a thin plate carrying a stylus. As the plate vibrates under the influence of a sound, the stylus makes minute indentations or undulations in the soft material, and these, when the cylinder or disk is again turned, set the plate in vibration, and reproduce the sound. Origin: Phono- + -graph. Source: Websters Dictionary (01 Mar 1998) |
| phonographer | 1. One versed or skilled in phonography. 2. One who uses, or is skilled in the use of, the phonograph. See Phonograph. Source: Websters Dictionary (01 Mar 1998) |
| phonographic | 1. Of or pertaining to phonography; based upon phonography. 2. Of or pertaining to phonograph; done by the phonograph. Origin: Cf. F. Phonographique. Source: Websters Dictionary (01 Mar 1998) |
| phonographical | 1. Of or pertaining to phonography; based upon phonography. 2. Of or pertaining to phonograph; done by the phonograph. Origin: Cf. F. Phonographique. Source: Websters Dictionary (01 Mar 1998) |