What does cruciger mean in Latin?

cruciger, a adjective, means “cross-bearing”.

Where does cruciger come from?

Proto-Indo-European *(s)ker-der.? → Proto-Italic *kruks /*krukis → Latin cruciger.

adjectivefirst/second-declension adjective (nominative masculine singular in -er)

cruciger (feminine crucigera, neuter crucigerum)

singular
form	masculine	feminine	neuter
nominative	in -er cruciger	crucigera	crucigerum
genitive	crucigerī	crucigerae	crucigerī
dative	crucigerō	crucigerae	crucigerō
accusative	crucigerum	crucigeram	crucigerum
ablative	crucigerō	crucigerā	crucigerō
vocative	cruciger	crucigera	crucigerum

plural
form	masculine	feminine	neuter
nominative	crucigerī	crucigerae	crucigera
genitive	crucigerōrum	crucigerārum	crucigerōrum
dative	crucigerīs	crucigerīs	crucigerīs
accusative	crucigerōs	crucigerās	crucigera
ablative	crucigerīs	crucigerīs	crucigerīs
vocative	crucigerī	crucigerae	crucigera

Proto-Indo-European *h₂eǵ- Proto-Italic *gezō Latin gerō Latin -ger Latin cruciger From crux + -ger.