Where does “sublungum” come from?

sublungum (Vulgar Latin) comes from Latin longum, from Latin longus, from Latin -ē, from Latin dis-, from Latin calceus, from Latin calx, from Ancient Greek χάλιξ — small stone, pebble; gravel, rubble.

Ancestry of “sublungum”, step by step

sublungum traces back through two separate lines of ancestry.

via Latin longum

Step	Language	Word	Meaning
1	Latin	longum	nominative neuter singular of longus; accusative...
2	Latin	longus	far, long; extended, prolonged; long; tedious,...
3	Latin	-ē	ly; used to form adverbs from adjectives
4	Latin	dis-	asunder, apart, in two; reversal, removal;...
5	Latin	calceus	shoe
6	Latin	calx	limestone; chalk; the finish line
7	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

via Latin sub

Step	Language	Word	Meaning
1	Latin	sub	under, beneath; behind; at the feet of
2	Proto-Italic	supo	under
3	Proto-Indo-European	upó	under, below
4	Proto-Indo-European	h₃ewp-	—

Words derived from “sublungum”

Every word from Ancient Greek χάλιξ →Every word from Latin dis- →Every word from Latin -ē →