From an unused root meaning to bore; a cleft -- hole.
H5357. naqiq
[נָקִיק] noun masculine cleft of rock; — only construct: singular הַסָּ֑לַע נְקִיק Jeremiah 13:4; plural הַסְּלָעִים נְקִיקֵי Isaiah 7:19 ("" הַבַּתּוֺת נַחֲלֵי), Jeremiah 16:16.