The word odor refers to any smell, scent, fragrance, or olfactory quality emitted by a physical substance, object, plant, animal, or human being. Odors are generated by volatile chemical molecules floating through the air that enter the nasal cavity and bind to specialized olfactory receptors, triggering neural signals to the brain. While odor can describe pleasant aromas like flowers or baking bread, it is frequently used in everyday language to characterize distinct, noticeable smells, both agreeable and foul.
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