a. rare–1. [f. VENTILATE v. + -ORY.] Of a hat: Provided with ventilation.
1839. Freeman’s Jrnl. 28 Oct., 3/3. Mr. Reid, of Edinburgh, who prepared former ventilatory matters connected with changes in the House of Commons, was present.
1850. in ‘Bat,’ Cricket Man., 112. Light summer hats, made on a principle entirely new, and being quite permeable to air, are … perfectly ventilatory.
