Crossword clue: a minute bronchial tube.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
any of the smallest bronchial ducts; ending in alveoli
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
any of the smallest bronchial ducts; ending in alveoli