Where does “penumbrous” come from?

penumbrous (English) comes from English -ous, from Middle English -ous, from Old French -us, from Latin -ōsus, from Old Latin -ōssus.

penumbrous (English): Partially shaded; Vague; ill-defined; unclear

Definitions

  1. Partially shaded; Vague; ill-defined; unclear

Ancestry of “penumbrous”, step by step

StepLanguageWordMeaning
1English-ousUsed to form adjectives from nouns, to denote...
2Middle English-ous—
3Old French-us-ous, used for forming adjectives
4Latin-ōsusose, -ous, -ful (full of or overly prone to)
5Old Latin-ōssus—
Every word from Old Latin -ōssus →Every word from Latin -ōsus →Every word from English -ous →