Black´ com`e`dy (blăk´ kǒm`ĕd`ŷ)
n. 1. (Drama) a comedy that treats of morbid, tragic, gloomy, or grotesque situations as a major element of the plot.
Since my post was so long yesterday, I will only point you in the direction of some of my favorite books that qualify as "black comedy". Click on the book's cover to go to its Goodreads page.
There are a lot more out there, I know. These are just the ones that burst into mind. What are your favorites?