[mass noun](especially in cider-making) the pulpy residue remaining after fruit has been crushed in order to extract its juice (尤指制作苹果汁或苹果酒所剩的)果渣 ■the pulpy matter remaining after some other substance has been pressed or crushed, for example castor oil seeds after the oil has been extracted 渣,油渣
语源
late 16th cent.: apparently from medieval Latin pomacium 'cider', from Latin pomum 'apple'