black mass – English noun declension

Noun: black mass

Singular	black mass
Plural	black masses

Local lore held that the quarry had once been the site of black masses.
An enormous number of monks and priests gave themselves up to sorcery, and there was no lack of apostate priests to perform the ceremonies of the Black Mass. [1936, Rollo Ahmed, The Black Art, London: Long, page 101:]
As a parish priest in England he had dabbled in the black arts, seduced a number of his congregation from their faith and finally celebrated the Black Mass. [1965, Attila Zohar, Kings Cross Black Magic, Sydney: Horwitz Publications, page 30:]
Elmos and Maureen had draped their room in some old purple rags and were about to start a black mass when the police arrived. [1970, Kevin Mackey, The Cure: Recollections of an Addict, Sydney: Angus and Robertson, published 1972, page 93:]
Generals gathered in their masses / Just like witches at black masses [1970, “War Pigs”, in Paranoid, performed by Black Sabbath:]
The paranormal investigators then aimed their cameras in the direction from which the black mass had been seen emerging.

English noun forms of black mass