disc▪ ʔanǧalᵘ does not seem to have cognates with similar semantics in Sem or outside. But it is prob. akin to other values of ↗√NǦL, now obsolete, esp. †naǧala ‘to pierce, split (s.th., with a spear); to make an opening in the ground (to plant s.th.), till the ground’ (†[v15]). The notion of an *‘opening’ is also present in †naǧl ‘outflowing water, spring’ or DaṯAr naǧīlaẗ ‘spring, well’ (†[v16]), in naǧala ‘to beget; offspring’, and, perh., in an obsolete (and hitherto unattested) meaning of ↗minǧal, now ‘sickle’ but at some stage perh. also *‘tool used to make openings in the soil to till the ground’.
▪ The (wide) ‘opening’ can perh. be connected to Ehret1995’s pre-protSem bi-consonantal root *√NG ‘to seep, ooze’ and Ǧabal2012’s bi-cons. Ar root nucleus *√NǦ‑ ‘breaking through [and welling/pouring out, i.e., eruption] of s.th. thick, but not solid, from within s.th.’.
▪ Etymology suggested by EtymArab: *†[v11] ‘to throw away, fling, strike off (a spear, etc.)’ > thereby †[v15] ‘split, pierce (s.th.)’ and cause a [v2] ‘gaping wound’, hence also ‘opening’ (in general) > ‘“gaping”, wide open eyes’.