Nehiloth

from The Collaborative International Dictionary of English v.0.48

Nehiloth \Ne"hi*loth\, n. pl. [Heb.] (Script.)
   A term supposed to mean, perforated wind instruments of
   music, as pipes or flutes. --Ps. v. (heading).
   [1913 Webster]

from Easton's 1897 Bible Dictionary

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.