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(Greek μακρος = big + Lat. moles = mass) molecule with a molecular mass over 10,000 and aggregates of such molecules.
(Greek μικρος = small) chemical element necessary for plants, animals and humans in very small quantities. Their lack causes numerous diseases. They are iodine, manganese, copper, cobalt, fluorine, selenium, etc. Syn.: micronutrient, elements in traces.
(Greek μακρος = small + Lat. moles = mass) molecule with a molecular mass lower than 10,000 and aggregates of such molecules.
(syn. blackhead, comedone; comedo, Lat. comedo = eater) formation made of sebum and exfoliated epithelium cells that closes secretion channels of sebaceous glands.