| ACO | a composite sensory nerve supplying the hair cells of the vestibular organ and the hair cells of the cochlea |
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| ACO | the physical intensity of sound |
| ACO | (acoustics) the pressure exerted on a surface normal to the direction of propagation of a sound wave |
| ACO | opposition to the flow of sound through a surface |
| ACO | opposition to the flow of sound through a surface |
| ACO | the distribution of energy as a function of frequency for a particular sound source |
| ACO | a storage device consisting of acoustic delay lines |
| ACO | (acoustics) a wave that transmits sound |
| ACO | of or relating to the science of acoustics |
| ACO | with respect to acoustics |
| ACO | a physicist who specializes in acoustics |
| ACO | the study of the physical properties of sound |