Ne·hi·loth n. pl.  Script. A term supposed to mean, perforated wind instruments of music, as pipes or flutes.
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  Nehiloth
     only in the title of Ps. 5. It is probably derived from a root
     meaning "to bore," "perforate," and hence denotes perforated
     wind instruments of all kinds. The psalm may be thus regarded as
     addressed to the conductor of the temple choir which played on
     flutes and such-like instruments.