Lexical Definition

‎מְגֵרָה‎ mᵉgêrâh (meg-ay-raw') saw H:N-F
from ‎גָּרַר‎

axe, saw.

1) saw (for stone cutting)

Usage: 4 forms in 4 verses
Form Translated As     In Verse(s)
וּבַמְּגֵר֔וֹת and with saws 1Chr.20.3
בַּמְּגֵרָ֜ה with saw 1Chr.20.3
בַּמְּגֵרָ֖ה with saw 1Kgs.7.9
בַּ֠מְּגֵרָה at the saws 2Sam.12.31

Brown-Driver-Briggs

‎מְגֵרָה‎ noun feminine saw (Late Hebrew id., perhaps from its harsh dragging sound) — ‎מְגֵרָה‎ 2Sam 12:31 a + 2 t.; plural ‎מְגֵרוֺת‎ 1Chr 20:3 (< ‎מַגְזְרוֺת‎ 2Sam 12:31 b) — saw, used in cutting stone ‎מְגֹרָרוֺת בַּמְּגֵרָה‎ 1Kgs 7:9 used in torture (or as tools for enforced labour) of captives 2Sam 12:31 a 1Chr 20:3 a.

Brown-Driver-Briggs References

Book Refs
2 Samuel 12:31
1 Kings 7:9
1 Chronicles 20:3