Where does “Laminaria” come from?

Laminaria (English) comes from Translingual Laminaria, from Latin -ārius, from Proto-Italic *-āzios.

Ancestry of “Laminaria”, step by step

Step	Language	Word	Meaning
1	Translingual	Laminaria	—
2	Latin	-ārius	—
3	Proto-Italic	*-āzios	—