fenestrum

The fenestrum is, moreover, rarely so situated that air can pass through it; the fenestral edges act as a constant irritant to the wound, producing bleeding and granulation tissue.

Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery Chevalier Jackson 1911

The fenestrum placed in the cannula in many of the older tubes, with the supposed function of allowing partial breathing through the larynx, is a most pernicious thing.

Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery Chevalier Jackson 1911