A slaughterhouse or abattoir was a place where livestock were butchered for their meat.
In 2259, Elder Gamal dismissively referred to the sickbay of the USS Enterprise as an "abattoir". (SNW: "Lift Us Where Suffering Cannot Reach")
In 2267, following Sybo's death while performing the Argelian empathic contact to determine Montgomery Scott's guilt or innocence in the murder of Kara, the accused chief engineer described an unknown presence as being "like a stinking draft out of a slaughterhouse". (TOS: "Wolf in the Fold")