sacr- I. combining form orsacro- Etymology: Middle English sacr-, from Middle French & Latin; Middle French, from Latin, from sacr-, sacer — more at sacred 1.: sacred : something sacred < sacral > 2.: sacred and < sacropictorial > II. combining form orsacro- Etymology: New Latin, from sacrum 1.: sacrum < sacral > 2.: sacrum and < sacrococcyx > : sacral and < sacrotuberous >