What's the difference between i.e. and e.g.?
1690s, from Latin sputum, noun use of neuter past participle of spuere "to spit" (see spew).
sputum spu·tum (spyōō'təm)n. pl. spu·ta (-tə) Matter coughed up and usually expelled from the mouth, especially mucus or mucopurulent matter expectorated in diseases of the air passages.