The Collaborative International Dictionary of English v.0.48:
Black comedy \Black" com`e*dy\ (bl[a^]k" k[o^]m`[e^]d*[y^]), n. (Drama) a comedy that treats of morbid, tragic, gloomy, or grotesque situations as a major element of the plot. [PJC]WordNet (r) 3.0 (2006):
black comedy n 1: comedy that uses black humor