before vowels carb-, word-forming element meaning "carbon," abstracted 1810 from carbon.
Entries linking to carbo-
carbon n.
non-metallic element occurring naturally as diamond, graphite, or charcoal, 1789, coined 1787 in French by Lavoisier as charbone, from Latin carbonem (nominative carbo) "a coal, glowing coal; charcoal," from PIE root *ker- (3) "heat, fire."
Carbon 14, the long-lived radioactive isotope used in dating organic deposits, is from 1936. Carbon-dating (using carbon 14) is recorded from 1958. Carbon cycle is attested from 1912; carbon footprint was in use by 2001. Carbon-paper "paper faced with carbon, used between two sheets for reproduction on the lower of what is drawn or written on the upper" is from 1855, earlier it was carbonic paper (1850).
carbohydrate n.
general name for a group of organic compounds consisting of carbon atoms in multiples of 6 and hydrogen and oxygen in the proportion of water, 1851, from carbo-, combining form of carbon, + hydrate (n.), denoting compound produced when certain substances combine with water, from Greek hydor "water" (from suffixed form of PIE root *wed- (1) "water; wet").
The name carbohydrate was given to these compounds because, in composition, they are apparently hydrates of carbon. In structure, however, they are far more complex. [Flood]