sound barrier
(uncountable) Sonic barrier, the sudden increase in drag (resistance) and other effects experienced by moving objects when their speed approaches that of sound or becomes supersonic (which used to be considered a barrier to higher speeds).
(uncountable, botany) Calamus scipionum, a species of thick rattan climbing palm native to Southeast Asia; its material; (inexact) closely similar species and their material.
plural of opéra comique
to breathe out or upon.
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