acoustic

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acoustic

, acoustical
1. of or related to sound, the sense of hearing, or acoustics
2. designed to respond to, absorb, or control sound
3. (of a musical instrument or recording) without electronic amplification
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

acoustic

[ə′küs·tik]
(acoustics)
Relating to, containing, producing, arising from, actuated by, or carrying sound.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

acoustic, acoustical

The qualifying adjectives acoustic and acoustical have the following meanings: arising from, actuated by, containing, producing, or related to sound. In general, acoustic is used when the term being qualified designates something that has the properties, dimensions, or physical characteristics associated with sound waves; acoustical is used when the term being qualified does not explicitly designate something that has the properties, dimensions, or physical characteristics of sound (e.g., acoustical engineering). However, sometimes these two terms are used interchangeably.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

acoustic

Associated with sound at frequencies that are audible to human beings.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Transvaginal pelvic ultrasound of the left ovary demonstrates a well-circumscribed, oval, anechoic, avascular cyst with posterior acoustic enhancement and thin, smooth walls.
Imaging appearances of fat necrosis Study Complex mass Anechoic mass (mural nodules, with posterior thick septations) acoustic enhancement Soo et al (11) 35.4% 6.5% Bilgen et al (12) 15% 16.6% Study Shadowing Total masses anechoic masses with cystic appearance Soo et al (11) 6.5% 48.4% Bilgen et al (12) 15.8% 47.4% Table 2.
A) Conventional sonography shows moderately obscured margins of the cyst (White arrows) B) Corresponding tissue hormonic image showing well-defined margin and posterior acoustic enhancement of the cystic lesion (White arrows).
Ultrasound showed irregular multiseptated cystic lesion with posterior acoustic enhancement in left iliac fossa (LIF), seen extending along iliac vessels, pre and para-aortic areas upto diaphragmatic hiatus (Fig.
Mammographically, schwannomas are most commonly described as a nonspecific, well-defined, round or oval density.[6,7,8] A normal mammogram and an illdefined mass have also been reported.[9] Sonographically, more variation in appearance has been reported; however it is most commonly reported as a solid hypoechoic well-defined mass with variable posterior acoustic enhancement. [6,8]
Ultrasound shows a well-defined lucent mass with posterior acoustic enhancement. A noninfected cyst will show uniform internal echotexture and septa that often occur in an infected pseudocyst.
(a) Epidermoid/dermoid cyst: The cyst is usually well-defined and anechoic with posterior acoustic enhancement in a midline position of the neck
The authors placed their findings into 6 groups: Solid; complex with mural nodule; complex with echogenic band; anechoic with posterior acoustic enhancement; anechoic with acoustic shadowing; and no discrete mass.
There are many electronically produced sounds that students are attempting to vocalize; deliberate nasality, vocal fry, robot-like sounds, and acoustic enhancements are regularly added to recordings of popular singing.