An Etymological Dictionary of Astronomy and Astrophysics

Tending to react. Pertaining to or characterized by reaction.

Etymology (EN): From → react + -ive a suffix of adjectives expressing tendency, disposition, function, connection, etc.

Etymology (PE): Vâžirandé verbal adj. of vâžiridan→ react; vâžireši, adj. of vâžireš→ reaction.