One of the mysteries of the English language finally explained.
Originally: any of a number of unsaturated hydrocarbons with the formula C₅H₈. Now specifically: an alkyne with this formula, especially (also 1-"pentyne") the unbranched isomer CH≡CCH₂CH₂CH₃.
Late 19th century; earliest use found in Henry Watts (1815–1884), chemist. From penta- + -yne.
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