*cunabula*

‖n. pl. [ L., a cradle, earliest abode, fr. cunae cradle. ] 1. The earliest abode; original dwelling place; originals; as, the cunabula of the human race. [ 1913 Webster ]

2. (Bibliography) The extant copies of the first or earliest printed books, or of such as were printed in the 15th century. [ 1913 Webster ]