| micracoustic | 1. Relating to faint sounds. 2. Magnifying very faint sounds so as to make them audible. Synonym: microcoustic. Origin: micro-+ G. Akoustikos, relating to hearing, fr. Akouo, to hear (05 Mar 2000) |
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| micraster | <paleontology> A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; from the starlike disposal of the ambulacral furrows. Origin: NL, fr. Gr. Small + star. Source: Websters Dictionary (01 Mar 1998) |