red heart
noun (1)Definition of red heart
(Entry 1 of 2)
: incipient decay in lumber indicated by a dark red discoloration not found in sound wood
specifically
: red rot sense 2b
redheart
noun (2)Definition of redheart (Entry 2 of 2)
: a California straggling shrub or small tree (Ceanothus spinosus) having dark red wood and blue-gray to white flowers and being used as an ornamental