From an unused root meaning to fold back; a spiral step -- winding stair. Compare lula'ah.
see HEBREW lula'ah
H3883. lul
[לוּל] noun [masculine] shaft or enclosed space (possibly in wall), with steps or ladder, only plural לוּלִים 1 Kings 6:8 יַעֲלוּׅ (וּבְלוּלִים, on meaning see StaZAW iii, 1883, 136 ff. > ᵑ9 ᵐ5 winding-stair, compare Buhl, see Stal. c (Late Hebrew לוּל winding passage or stair, or enclosed space in which is a winding stair, according to LevyNHWB ii. 486, but see Stal.c.; √ dubious; hardly לולו below)
לוּלֵי לוּלֵא, see below לוּ.
לולו (apparently secondary √ from III. לוה turn, twist, wind, whence following).