Where does “ἀνάπτυξις” come from?

ἀνάπτυξις (Ancient Greek) comes from Ancient Greek ἀναπτύσσω, from Ancient Greek ἀνα-, from Ancient Greek ᾰ̓νᾰ́ — up; to, again, upon.

ἀνάπτυξις (Ancient Greek): gaping, opening, unfolding