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molecular biology 1 today the branch of biology concerned with the chemical and physical composition, properties, and activities of molecules, such as proteins and nucleic acids, in living cells. Kids Adv.
bud1 1 today a swelling on a plant that can develop into new parts, such as leaves or a flower. [8 definitions] Main Adv.
pain 1 today physical distress or discomfort that is usu. caused by injury or illness and is the nervous system's means of signaling to the brain that something is wrong. [7 definitions] Main Adv.