[f. the first syllables of car-bon, fer-rum (iron), and al-umina, of which substances it is compounded.] (See quots.)
1881. Nature, XXV. 62. The powers of carferal, well known as a filtering medium in the removal of ammonia from sewage.
1884. Health Exhib. Catal., 65/1. Carferal, a new … filtering material compounded of alumina, iron and carbon.
