black mass 
noun
A travesty of the Roman Catholic Mass in worship of the Devil.Would the devil worshipers ever perform black masses?...
- So many occult practices emphasize the inversion of the natural order - recall the black mass in which the Catholic mass was chanted backwards.
- He swears we will witness a black mass and some manner of hideous human sacrifice.
- heading course
- heading dog
- heading joint
- heading knife
- heading machine
- heading up
- head job
- head-kerchief
- head kidney
- head knee
- head knife
- headlamp
- headland
- headland speech
- head lease
- headledge
- headless
- headless chicken
- headless cross
- head lessee
- headless horse
- headless horseman
- headlessness
- headlet
- headlight