What does xanthelasmoīdeus mean in Latin?

xanthelasmoīdeus, a adjective, means “of or resembling xanthelasma”.

How do you pronounce xanthelasmoīdeus?

In classical Latin, [ksan.tʰɛ.ɫas.moˈiː.de.ʊs]; in ecclesiastical (church) Latin, [ksan.te.laz.moˈiː.de.us].

adjectivefirst/second-declension adjective

xanthelasmoīdeus (feminine xanthelasmoīdea, neuter xanthelasmoīdeum)

Classical[ksan.tʰɛ.ɫas.moˈiː.de.ʊs]Ecclesiastical[ksan.te.laz.moˈiː.de.us]

singular
form	masculine	feminine	neuter
nominative	xanthelasmoīdeus	xanthelasmoīdea	xanthelasmoīdeum
genitive	xanthelasmoīdeī	xanthelasmoīdeae	xanthelasmoīdeī
dative	xanthelasmoīdeō	xanthelasmoīdeae	xanthelasmoīdeō
accusative	xanthelasmoīdeum	xanthelasmoīdeam	xanthelasmoīdeum
ablative	xanthelasmoīdeō	xanthelasmoīdeā	xanthelasmoīdeō
vocative	xanthelasmoīdee	xanthelasmoīdea	xanthelasmoīdeum

plural
form	masculine	feminine	neuter
nominative	xanthelasmoīdeī	xanthelasmoīdeae	xanthelasmoīdea
genitive	xanthelasmoīdeōrum	xanthelasmoīdeārum	xanthelasmoīdeōrum
dative	xanthelasmoīdeīs	xanthelasmoīdeīs	xanthelasmoīdeīs
accusative	xanthelasmoīdeōs	xanthelasmoīdeās	xanthelasmoīdea
ablative	xanthelasmoīdeīs	xanthelasmoīdeīs	xanthelasmoīdeīs
vocative	xanthelasmoīdeī	xanthelasmoīdeae	xanthelasmoīdea

Apparently a back formation from English xanthelasmoidea (“a disease resembling xanthelasma”) for the creation of species names.