From galal; a roll -- roll, volume.
see HEBREW galal
H4039. megillah
מְגִלָּה noun feminine roll (writing, book; late) — ׳מ Jeremiah 36:28 16t.; construct מְגִלַּתֿ Psalm 40:8 3t.; — roll of writing, book מְגִלַּתסֵֿפֶר Jeremiah 36:2, 4; Ezekiel 2:9; Psalm 40:8; ׳מ alone Jeremiah 36:6, 14 (twice in verse); 36:20-21, 23, 25, 27, 28 (twice in verse); 36:29, 32; Ezekiel 3:1-2, 3; Ze 5:1-2,.
מְגִלָּה noun feminine (book-)roll (ᵑ7 Biblical Hebrew); — Ezra 6:2.