of, like, or containing carbon.

1785–95; carbon + -aceous

subcarbonaceous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
carbonaceous (ˌkɑːbəˈneɪʃəs)
of, resembling, or containing carbon

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
carbon   (kär'bən)  Pronunciation Key 
Symbol C
A naturally abundant, nonmetallic element that occurs in all organic compounds and can be found in all known forms of life. Diamonds and graphite are pure forms, and carbon is a major constituent of coal, petroleum, and natural gas. Carbon generally forms four covalent bonds with other atoms in larger molecules. Atomic number 6; atomic weight 12.011; sublimation point above 3,500°C; boiling point 4,827°C; specific gravity of amorphous carbon 1.8 to 2.1, of diamond 3.15 to 3.53, of graphite 1.9 to 2.3; valence 2, 3, 4. See Periodic Table.

carbonaceous adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Carbonaceous to calcareous siltstones have also been observed.
Expect some ups and downs of climate but don't hold your breath for carbonaceous heat or glacier attacks anytime soon.
The higher pH released calcium ions taken up from the water by carbonaceous polymers that form part of the mat.
It appears similar to a group of asteroids known as carbonaceous chondrites.
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