Where does “proglaciaire” come from?

proglaciaire (French) comes from French glaciaire, from French -aire, from Latin -ārius, from Proto-Italic *-āzios — Forms relational adjectives to nouns (and rarely numerals).

proglaciaire (French): proglacial

Definitions

proglacial

Ancestry of “proglaciaire”, step by step

Step	Language	Word	Meaning
1	French	glaciaire	glacial
2	French	-aire	-ary; -aire
3	Latin	-ārius	er
4	Proto-Italic	*-āzios	Forms relational adjectives to nouns (and rarely numerals)

Every word from Proto-Italic *-āzios →Every word from Latin -ārius →Every word from French -aire →