pneumatic tire

A rubber tire made hollow and then inflated with air. In common use for the wheels of bicycles, buggies, sulkies, and other vehicles. Specially adapted for ease and speed. The quickest records of racing sulkies have been made where the pneumatic-tire has been used. pneumatic-trough, s. Chem.: A ve el used in the collection of gases. It is usually made of iron or copper, and is provided with a shelf for holding the jars or bottles to be filled with gas. The shelf is perforated with one or more holes, to receive the end of the delivery tube of the gas apparatus, and the water in the trough kept at about one inch above the level of dig an shire, Wales. Plynlimmon-group, s . Geol.: A group of strata, named by Sedgwick. They belong to the Lower Llandovery. P. M., abbrev. [See def.) Post-meridian. pn is pronounced as n. pneu-ma-, pneu-ma-to-, pref . [Greek pneuma (gen it. pneumatos)=wind, air; pneo to blow, to breathe.] Pertaining to or connected with the air, breath, or gases. pneu-ma-thör'-ax, s. [PNEUMOTHORAX.]