
1) Canal 2) Channel 3) Duct 4) Ending in alveoli 5) Epithelial duct
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https://www.crosswordclues.com/clue/bronchiole

The bronchioles or bronchioli are the passageways by which air passes through the nose or mouth to the alveoli (air sacs) of the lungs, in which branches no longer contain cartilage or glands in their submucosa. They are branches of the bronchi, and are part of the conducting zone of the respiratory system. The bronchioles divide further into smal...
Found on
http://en.wikipedia.org/wiki/Bronchiole

• (n.) A minute bronchial tube.
Found on
http://thinkexist.com/dictionary/meaning/bronchiole/

(from the article `respiratory disease`) It is in the smaller bronchi that major obstruction commonly occurs in asthma: these bronchi contain smooth muscle in their walls, and the muscle may ... [3 related articles]
Found on
http://www.britannica.com/eb/a-z/b/116

A tiny branch of air tubes in the lungs.
Found on
http://www.cancer.gov/dictionary?expand=B

A small (less than 1 mm diameter) air-conducting tube of the tetrapod lung. Bronchioles arise as branches of a bronchus and terminate in alveoli. The walls of bronchioles are abundant in smooth muscle, which controls the size of the lumen. The cartilage and mucus glands found in bronchi are absent.
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http://www.daviddarling.info/encyclopedia/B/bronchiole.html

<anatomy> This refers to the smaller airways in the lungs. A minute subdivisions of the bronchi that terminate in the alveoli (oxygen exchange apparatus). ... (13 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973

(brong´ke-ōl) one of the successively smaller channels into which the segmental bronchi divide within the bronchopulmonary segments. adj., bronchi´olar., adj. respiratory bronchioles the final branches of the bronchioles, communi...
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http://www.encyclo.co.uk/local/21001
Bron'chi·ole noun (Anat.) A minute bronchial tube.
Found on
http://www.encyclo.co.uk/webster/B/103

Type: Term Pronunciation: brong′kē-ōl Definitions: 1. One of approximately six generations of increasingly finer subdivisions of the bronchi, all smaller than 1 mm in diameter, and having no cartilage in its wall, but relatively abundant smooth muscle and elastic fibers. Synonyms: bronchiolus
Found on
http://www.medilexicon.com/medicaldictionary.php?t=12416

Bronchiole: A tiny tube in the air conduit system within the lungs that is a continuation of the bronchi and connects to the alveoli (the air sacs) where oxygen exchange occurs. Bronchiole is the diminutive of bronchus, from the word bronchos by which the Greeks referred to the conduits to the lungs. Bronchiolitis is inflammation of the bronchioles...
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http://www.medterms.com/script/main/art.asp?articlekey=2535

(brong;keol) A small division of a bronchus within the lung.
Found on
http://www.mhhe.com/biosci/abio/glossary.mhtml

[
n] - any of the smallest bronchial ducts
Found on
http://www.webdictionary.co.uk/definition.php?query=bronchiole
noun any of the smallest bronchial ducts; ending in alveoli
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https://www.encyclo.co.uk/local/20974

Small-bore air tube found in the vertebrate lung responsible for delivering air to the main respiratory surfaces. Bronchioles lead off from the larger bronchus and branch extensively before terminating in the many thousand alveoli that form the bulk of lung tissue
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https://www.encyclo.co.uk/local/21221

diminutive of bronchus, hence a small bronchus (bronchi have cartilage in their walls, bronchioles have no cartilage).
Found on
https://www.encyclo.co.uk/local/21450

a small branch of a bronchus.
Found on
https://www.infoplease.com/dictionary/bronchiole

a small airway (subdivision of the bronchus) through which air flows into portions of the lung.
Found on
https://www.stanfordchildrens.org/en/topic/default?id=pediatric-glossary---
No exact match found.