Where does “understratum” come from?

understratum (English) comes from English stratum, from Latin strātum, from Ancient Greek σφαῖρα, from Ancient Greek -ειδής, from Ancient Greek -ής, from Proto-Indo-European -ēs, from Proto-Indo-European -ess, from Proto-Indo-European -os — Creates action nouns or result nouns from verbs;...

understratum (English): The layer, or stratum, of earth on which the soil...

Definitions

  1. The layer, or stratum, of earth on which the soil...

Ancestry of “understratum”, step by step

understratum traces back through two separate lines of ancestry.

via English stratum

StepLanguageWordMeaning
1EnglishstratumOne of several parallel horizontal layers of...
2Latinstrātuma bed-covering, coverlet, quilt, blanket
3Ancient Greekσφαῖραball, globe, sphere
4Ancient Greek-ειδήςlike, connected to, from the nature of, full of;...
5Ancient Greek-ήςadjective suffix
6Proto-Indo-European-ēsPrimarily forms adjectival bahuvrīhi compounds
7Proto-Indo-European-ess
8Proto-Indo-European-osCreates action nouns or result nouns from verbs;...

via English under

StepLanguageWordMeaning
1EnglishunderIn or at a lower level than; As a subject of;...
2Middle Englishunderunder
3Old Englishunderunder, beneath
4Proto-Germanicunderamong, between; under, beneath; under
5Proto-Indo-Europeanh₁entérbetween
6Proto-Indo-Europeanh₁enin; in, inside
Every word from Proto-Indo-European -osEvery word from Ancient Greek -ειδήςEvery word from Ancient Greek σφαῖρα