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NehilothEASTON'S
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.
Easton's Illustrated Bible Dictionary, 3rd ed. (1897), public domain.