Where does “līneālis” come from?

līneālis (Latin) comes from Latin līnea, from Latin līnum, from Proto-Italic līnom, from Proto-Indo-European līnom — flax.

Ancestry of “līneālis”, step by step

Step	Language	Word	Meaning
1	Latin	līnea	—
2	Latin	līnum	—
3	Proto-Italic	līnom	—
4	Proto-Indo-European	līnom	flax

līneālis — Etymology, Origin & Word History | Etymology Explorer