Simple past tense and past participle of lopper.(verb)
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Use "loppered" in a sentence
"Three cupfuls of soft sugar, two cupfuls of flour, half a cupful of butter, one teacupful of loppered milk, five eggs well beaten, two tablespoonfuls of rose-water, three-quarters of a pound of almonds, blanched and chopped _very_ fine, one teaspoonful of soda dissolved in boiling water."
"Put a pan of sour or loppered milk on the stove or range where it is not too hot; let it scald until the whey rises to the top (be careful that it does not boil, or the curd will become hard and tough)."
"Any one who knows anything about dairy work knows what loppered milk is."