Etymology
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Words related to -ane

-ene 
hydrocarbon suffix, from Greek name-forming element -ene. It has no real meaning in itself; in chemistry terminology probably abstracted from methylene (1834). Put in systematic use by Hofmann (1865).
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-ine (2)
word-forming element in chemistry, often interchangeable with -in (2), though modern use distinguishes them; early 19c., from French -ine, the suffix commonly used to form words for derived substances, hence its extended use in chemistry. It was applied unsystematically at first (as in aniline), but now has more restricted use.

The French suffix is from Latin -ina, fem. form of -inus, suffix used to form adjectives from nouns, and thus is identical with -ine (1).
-one 
chemical suffix, from Greek -one, female patronymic (as in anemone, "daughter of the wind," from anemos); in chemical use denoting a "weaker" derivative. Its use in forming acetone (1830s) gave rise to the specialized chemical sense.
butane (n.)
paraffin hydrocarbon, 1875, from butyl, hydrocarbon from butyric acid, a product of fermentation found in rancid butter, from Latin butyrum (see butter (n.)) + chemical suffix -ane.
ethane (n.)
1873, from ethyl + -ane, the appropriate suffix under Hofmann's system.
heptane (n.)
1872; see hepta- "seven" + chemical ending -ane. So called for its 7 carbon molecules.
hexane (n.)
paraffin hydrocarbon, 1872, from Greek hex "six" (see six) + chemical suffix -ane. So called for its six carbon atoms.
methane (n.)

"inflammable colorless and odorless gas; marsh gas," 1867, coined from chemical suffix -ane + syllable abstracted from methyl.

octane (n.)

hydrocarbon of the methane series, 1872, coined from oct- "eight" (see octa-) + -ane; so called because it has eight carbon atoms. A fuel's octane rating, in reference to its anti-knocking quality, is attested from 1932.

propane (n.)

"colorless gas occurring in petroleum," 1866, with chemical suffix -ane + prop(ionic acid) (1850), from French propionique (1847), from Greek pro "forward" (see pro-) + pion "fat" (see fat (adj.)), which was so named in reference to its being first in order of the fatty acids.