[f. COG sb.2 or v.1] Furnished with cogs; having cog-wheels.
1825. J. Nicholson, Operat. Mechanic, 654. A toothed rack … into which a toothed or cogged wheel … plays.
1862. Smiles, Engineers, III. 97. Cogwheels which acted on the cogged rail.
1879. Cath. & Craufurd Tait, 561. There we changed into the cogged cars, and went sheer up the face of the mountain.
b. Med. Cogged-wheel breathing, rhythm: term for a jerky respiratory sound in chest-affections, somewhat resembling the sound of a cogged wheel in motion.
1881. in Syd. Soc. Lex.
1886. Fagge, Princ. & Pract. Med., I. 963. I have repeatedly noticed that the separate sounds which make up cogged-wheel breathing are synchronous with as many cardiac pulsations. Ibid. In all probability the ‘cogged-wheel rhythm’ was due to the action upon the healthy lung of an irritable heart.
