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“perennial” in Latin

The English word perennial itself goes back to Latin annus, through perennis.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

perennial
Lasting a year, perennis; annuus.
Lasting many years (botany), perennis. To be a perennial, perennare (e.g., quo melius ficus perennet, Col., 12, 5, 2; but this is only of keeping a long time; still perennis, perennare must be retained as technical terms).

Quick answer

What is the Latin word for perennial?
The usual Latin words for “perennial” are perennis, annuus, perennō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.