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asphalt	a sticky brown to black bituminous substance, occurring naturally or obtained as a by-product of refining petroleum and coal tar, and used for paving, roofing, and waterproofing. [1/4 definitions]
bioluminescence	the emission of light produced naturally by certain kinds of insects, fish, or bacteria, or such light itself.
borax	a white substance found in naturally occurring borates and used as a cleansing or flushing agent, in the production of ceramics, and in tanning.
boron	a chemical element that has five protons in each nucleus and that occurs naturally only in compounds such as boric acid and borax. (symbol: B)
caffeine	a bitter substance that occurs naturally in coffee, tea, chocolate, and certain other substances and has stimulant and diuretic effects.
carbon dioxide	a colorless, odorless, incombustible gas that is produced naturally in breathing, combustion, and decomposition, and commercially for use in dry ice, fire extinguishers, and carbonated beverages.
cerium	a highly reactive chemical element of the rare-earth group that has fifty-eight protons in each nucleus and that occurs naturally only in compounds. (symbol: Ce)
Chile saltpeter	naturally occurring sodium nitrate, esp. as found in Chile and Peru.
chlorine	a chemical element of the halogen group that has seventeen protons in each nucleus, occurs naturally only in compounds such as sodium chloride and chloroform, and can be isolated in pure form as a toxic yellow-green gas. (symbol: Cl) [1/2 definitions]
CO2	abbreviation of "carbon dioxide," a colorless, odorless, incombustible gas that is produced naturally in breathing, combustion, and decomposition, and commercially for use in dry ice, fire extinguishers, and carbonated beverages.
cobblestone	a naturally rounded stone, about the size of a fist, formerly used in paving streets or the like.
crystal	a naturally symmetrical or layered solid, such as diamond or quartz, with a regularly repeating three-dimensional atomic, ionic, or molecular structure. [1/7 definitions]
deposit	a quantity of a substance existing naturally beneath the ground. [1/10 definitions]
dextrose	a form of sugar that occurs naturally in plant and animal tissue or is synthesized from starch. (See glucose.)
electricity	a physical phenomenon caused by the movement of certain charged particles such as electrons, esp. between points having different electrical charges, and seen in naturally occurring phenomena such as lightning and magnetic attraction and repulsion. [1/4 definitions]
fatty acid	any of a large class of acids, such as palmitic, stearic, and oleic, that occur naturally in animal and vegetable fats and oils.
fluorine	an extremely reactive chemical element of the halogen group that has nine protons in each nucleus and that occurs naturally only in compounds such as fluoride salts, but that can be isolated in pure form as a yellowish, highly toxic gas. (symbol: F)
formic acid	a colorless, caustic organic acid, naturally emitted by ants, nettles, spiders, and the like as a stinging defense, and synthetically produced for use in a variety of industrial processes.
furry	being naturally covered in fur, as an animal or part of an animal's body. [1/3 definitions]
germanium	a tetravalent metal chemical element that has thirty-two protons in each nucleus and occurs naturally as a contaminant of coal, but can be purified for use in transistors and as a component of high-quality optical glass. (symbol: Ge)
glucose	a form of sugar that occurs naturally in fruits, plants, and animal tissues; grape sugar. [1/2 definitions]

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