The biological process whose specific outcome is the progression of a bronchiole from an initial condition to its mature state. This process begins with the formation of the bronchiole and ends with the mature structure. A bronchiole is the first airway branch that no longer contains cartilage; it is a branch of the bronchi. [GOC:dph, GOC:mtg_lung]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process