Where does “longworm” come from?

longworm (English) comes from English long, from English longitude, from Old French longitude, from Latin longitūdō, from Latin longus, from Latin -ē, from Latin dis-, from Latin calceus — small stone, pebble; gravel, rubble.

Ancestry of “longworm”, step by step

longworm traces back through two separate lines of ancestry.

via English long

StepLanguageWordMeaning
1EnglishlongHaving much distance from one terminating point...
2EnglishlongitudeAngular distance measured west or east of the...
3Old Frenchlongitude
4Latinlongitūdōlength, longitude; longness
5Latinlongusfar, long; extended, prolonged; long; tedious,...
6Latinly; used to form adverbs from adjectives
7Latindis-asunder, apart, in two; reversal, removal;...
8Latincalceusshoe
9Latincalxlimestone; chalk; the finish line
10Ancient Greekχάλιξsmall stone, pebble; gravel, rubble

via English Worm

StepLanguageWordMeaning
1EnglishWormA generally tubular invertebrate of the annelid phylum; an earthworm
2Middle EnglishwormA worm or similar small wormlike animal that...
3Old Englishwyrmcreeping insect; maggot, grub, worm; snake,...
4Old Englishlēahmeadow; clearing with a pigsty; woodland,...
5Proto-West Germaniclauhclearing; meadow
6Proto-Germaniclauhazclearing; meadow
7Proto-Indo-Europeanlówkosclearing; open space, clearing; field, meadow
8Proto-Indo-Europeanlewḱ-lynx
9Proto-Indo-Europeanlewk-bright; to shine; to see
Every word from Ancient Greek χάλιξEvery word from Latin dis-Every word from Latin