A Grammatical Dictionary of Botanical Latin

trimus,-a,-um (adj.A): three years old.

trimus,-a,-um (adj.A): of three years, three years old, continuing three years; triennial, i.e. requiring three years to form its flowers and fruit, and then dying (after Lindley) [> L. tres, ‘three,’ and root ... perhaps L. hiems, hibernus, hence, of three winters), “of three years, three years old” (after Lewis & Short); cf. bimus,-a,-um (adj.A), lasting two years; quadrimus,-a,-um (adj.A), lasting four years; see triennis,-e (adj.B);

- dies trimus “a term of three years.”

- Herba annua dicitur, quae eodem anno nata flore fructuque perfectis moritur, ut frumenta. Bima vero, Trimave, quae intra spacium duorum vel trium annorum sua tempora perficit (Tourn.), an herb is called ‘annual,’ which, having been born, dies in the same year, after the the flower and fruit have been perfected, as in grain crops. In fact [an herb is herba] ‘bima’ [i.e. continuing two years], or [herba] ‘trima’ [i.e. continuing three years], that, within the space of two or three years, completes it’s own [i.e. particular] lifetime.