PS

*gargūm(-at)- - throat (SED I No. 93)

The root is presumably derived from *garm-. On the other hand, cf. Afras. quadriliteral roots.

Mandaic
gurgma - maw, gullet (MD 85)
Arabic
g(a)rāǯəm - amygdal (Dozy I 182)
Arabic
garǯūma - gorge (Dozy I 182)
Tigre
gərgəmmät - throat, windpipe (WTS 578)
Tigre
gərguma - throat, windpipe (WTS 578)