monopodium
noun
a single main axis that continues to extend at the apex in the original line of growth, giving off lateral branches beneath in acropetal succession.
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Dimensions of the Trachea and Bronchi.—It will be noted that the bronchi divide monopodially, not dichotomously.
From Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery by Chevalier Jackson