n. A large African forest tree (Nauclea diderrichii) yielding a strong hard yellow to golden brown lumber; sometimes placed in genus Sarcocephalus, and then called Sarcocephalus diderrichii. Syn. -- Nauclea diderrichii, Sarcocephalus diderrichii. [ WordNet 1.5 ]
{ ‖ } n. [ It. peperino, L. piper pepper. So called on account of its color. ] (Geol.) A volcanic rock, formed by the cementing together of sand, scoria, cinders, etc. [ 1913 Webster ]