1. Itaboraian - Adjective
2. Itaboraian - Proper noun
Itaboraian
(geology, paleontology) A geologic age, 53.0–50.0 mya and within the Ypresian (Early Eocene), whose stratotype is the Itaboraí Formation; used especially in the context of South American land mammal age (SALMA) classification.
Itaboraian (not comparable)
(geology, paleontology) Of, pertaining to or occurring within the Itaboraian age.