pinaceous (pa??ne???s) adj (Botany) of, relating to, or belonging to the Pinaceae, a family of conifers with needle-like leaves: includes pine, spruce, fir, larch, and cedar[C19: via New Latin from Latin p?nus a pine]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014