in·cu·nab·u·lum 
(ĭn′kyə-năbyə-ləm, ĭng′-)
(ĭn′kyə-năbyə-ləm, ĭng′-)n. pl. in·cu·nab·u·la (-lə)
1. A book printed before 1501; an incunable.
2. An artifact of an early period.
[New Latin incūnābulum, from sing. of Latin incūnābula, swaddling clothes, cradle : in-, in; see IN-2 + cūnābula, cradle, infancy (from cūnae, cradle; see kei- in the Appendix of Indo-European roots).]
in′cu·nabu·lar (-lər) adj.