What does "astilbe" mean?

Any species, subspecies, cultivar, or specimen of the genus Astilbe.

What is a synonym for "astilbe"?

Common synonyms include: false spirea.

noun

noun ·Rare ·Advanced level

Noun

1
Any species, subspecies, cultivar, or specimen of the genus Astilbe.
2
any plant of the genus Astilbe having compound leaves and showy panicles of tiny colorful flowers wordnet

From the genus name.