Where does “trilinearly” come from?

trilinearly (English) comes from English linearly, from English -ly, from English grisly, from Middle English grisely, from Old English grisliċ, from Old English -līċ, from Proto-Germanic *-līk.

trilinearly (English): In a trilinear manner

Definitions

  1. In a trilinear manner

Ancestry of “trilinearly”, step by step

trilinearly traces back through two separate lines of ancestry.

via English linearly

StepLanguageWordMeaning
1EnglishlinearlyIn a linear manner; In a straight line;...
2English-lyUsed to form adjectives from nouns, the...
3EnglishgrislyHorrifyingly repellent; gruesome, terrifying;...
4Middle Englishgrisely
5Old Englishgrisliċgrisly, horrible; dreadful, horrid
6Old English-līċsuffix forming {{glossary|adjective}}s meaning...
7Proto-Germanic*-līk

via English tri

StepLanguageWordMeaning
1Englishtritriathlon; triangle
2Proto-Indo-Europeantréyesthree
Every word from Proto-Germanic *-līk