primum ver

From prīmum (“first”) +‎ vēr (“spring”). Attested in Late Latin glosses and in the fourth-century Mulomedicina Chironis in the ablative form prīmō vēre.

prīmum vēr n (genitive prīmī vērī); second declension

1. (Late Latin) early spring

Second-declension adjective with a third-declension noun (neuter, imparisyllabic non-i-stem).

• prīma vēra (feminized variant)

• Old French: primevoir, primevert
• Old Occitan: primver

• Walther von Wartburg (1928–2002) “ver”, in Französisches Etymologisches Wörterbuch, volumes 14: U–Z, page 272