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natural aging
natural business year
natural childbirth
natural death
natural disaster
natural fiber
natural food
natural frequency
natural gas
natural history
natural killer cell
natural language
natural language processing
natural law
natural light
natural logarithm
natural medicine
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natural gas
nat·u·ral gas


noun 
Definition:
 
combustible mixture of hydrocarbon gases: a mixture of combustible hydrocarbon gases, mostly methane and ethane, found trapped in the pore spaces of some sedimentary rocks, often along with petroleum deposits
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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