An Etymological Dictionary of Astronomy and Astrophysics
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A colorless, odorless → hydrocarbon, C₂H₆, which occurs with → methane in natural gas.

From eth-, from → ethyl, + -ane a suffix used in names of hydrocarbons of the methane or paraffin series.

A colorless, odorless, inflammable gas gas of formula CH₄; the simplest hydrocarbon.

From meth- a combining form representing methyl + -ane a suffix used in names of hydrocarbons of the methane or paraffin series.