What does acernus mean in Latin?

acernus, a adjective, means “made of maple”.

How do you pronounce acernus?

In classical Latin, [aˈkɛr.nʊs]; in ecclesiastical (church) Latin, [aˈt͡ʃɛr.nus].

adjectivefirst/second-declension adjective

acernus (feminine acerna, neuter acernum)

Classical[aˈkɛr.nʊs]Ecclesiastical[aˈt͡ʃɛr.nus]

singular
form	masculine	feminine	neuter
nominative	acernus	acerna	acernum
genitive	acernī	acernae	acernī
dative	acernō	acernae	acernō
accusative	acernum	acernam	acernum
ablative	acernō	acernā	acernō
vocative	acerne	acerna	acernum

plural
form	masculine	feminine	neuter
nominative	acernī	acernae	acerna
genitive	acernōrum	acernārum	acernōrum
dative	acernīs	acernīs	acernīs
accusative	acernōs	acernās	acerna
ablative	acernīs	acernīs	acernīs
vocative	acernī	acernae	acerna

ăcernus, a, um, adj. 1. ăcer,

I. made of maple: equus trabibus contextus acernis, Verg. A. 2, 112; 9, 87: solio, ib. 8, 178: mensa, Hor. S. 2, 8, 10; cf. Mart. 14, 90: mensae, Ov. Met. 12, 254 al.

From acer (“maple”).