(syn. Lophoceros Ϯ African Grey Hornbill L. nasutus ) Gr. γραμμικος grammikos  engraved, inscribed, lined  < γραμμη grammē  line  < γραφω graphō  to write; Reichenbach's 1849, pl. XLIX, shows the white ridges on the lower mandible of what appears to be an adult female of this hornbill.

Search for more names on the Key to Scientific Names in Ornithology by James A. Jobling.
Recommended citation
Jobling, J. A. (2018). Key to Scientific Names in Ornithology. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.) (2018). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 14 December 2018).