Where does “mast foot” come from?

mast foot (English) comes from English Mast, from French masse, from Old French mace, from Vulgar Latin mattia, from Latin mateola, from Latin -ulus, from Proto-Italic -olos, from Proto-Italic -elos — Forms agent nouns from verbal roots.

Ancestry of “mast foot”, step by step

mast foot traces back through two separate lines of ancestry.

via English Mast

StepLanguageWordMeaning
1EnglishMast
2Frenchmassea paste, a dough; large amount or quantity of...
3Old Frenchmacemace weapon
4Vulgar Latinmattia
5LatinmateolaThe meaning of this term is uncertain....
6Latin-ulusUsed to form a diminutive of a noun, indicating...
7Proto-Italic-olos
8Proto-Italic-elosForms desubstantival and deadjectival diminutive nouns
9Proto-Indo-European-e-lós
10Proto-Indo-European-lósForms agent nouns from verbal roots

via English foot

StepLanguageWordMeaning
1EnglishfootA biological structure found in many animals that...
2Middle Englishfotfoot; The bottom, lower part or foundation of...
3Old Englishfōtfoot
4Proto-West Germanicfōtfoot
5Proto-Germanicfōtsfoot
6Proto-Indo-Europeanpṓdsfoot
7Proto-Indo-Europeanpódsfoot
8Proto-Indo-Europeanped-to walk, to step; to stumble, to fall
Every word from Proto-Indo-European -lósEvery word from Latin -ulusEvery word from Latin mateola