What does apterus mean in Latin?

apterus, a adjective, means “wingless”.

How do you pronounce apterus?

In classical Latin, [ˈap.tɛ.rʊs]; in ecclesiastical (church) Latin, [ˈap.te.rus].

adjectivefirst/second-declension adjective

apterus (feminine aptera, neuter apterum)

Classical[ˈap.tɛ.rʊs]Ecclesiastical[ˈap.te.rus]

New Latinadjectivewingless
COCCUS. Rostrum pectorale. Abdomen postice setosum. Alæ II. erectæ masculis. Feminæ apteræ.1761, Nicolaus Poda von Neuhaus, Insecta musei Graecensis, page 10:

singular
form	masculine	feminine	neuter
nominative	apterus	aptera	apterum
genitive	apterī	apterae	apterī
dative	apterō	apterae	apterō
accusative	apterum	apteram	apterum
ablative	apterō	apterā	apterō
vocative	aptere	aptera	apterum

plural
form	masculine	feminine	neuter
nominative	apterī	apterae	aptera
genitive	apterōrum	apterārum	apterōrum
dative	apterīs	apterīs	apterīs
accusative	apterōs	apterās	aptera
ablative	apterīs	apterīs	apterīs
vocative	apterī	apterae	aptera

Borrowed from Ancient Greek ἄπτερος (ápteros). Analyzable as a- + pterus.