Biology classifies living beings into kingdoms. This classification is not arbitrary: it describes life forms with different metabolic and structural characteristics. From here, zoology uses terms like 'herbivore', 'carnivore', and 'omnivore' to describe dietary conditions. There is no moral judgment in these words: they only describe physiological adaptations.

If we consult the Dictionary of the Institute of Catalan Studies (DIEC2), milk is the "white or yellowish fluid secreted by the mammary glands of female mammals, which serves to nourish their young." This is surely the restrictive definition defended by part of the dairy industry—ignoring the last part of the definition, it is clear: "For the nourishment of their young"—especially in relation to European regulations governing trade names.