Entry 1 sense Webster, 1913 Fossiliferous /fäsˌ-əl-ĭf'-ẽr-əs/ · Fos·sil·if·er·ous · IPA /fˌɑsəlˈɪfərəs/ 01 a. Containing or composed of fossils. 1. Containing or composed of fossils.(Paleon.)