hexine

from The Century Dictionary.

• noun A colorless unstable liquid, CH₃.C C(CH₂)₂CH₃, which boils at 83–84° C. It is prepared from hexylene bromide and is homologous with acetylene. Also called methyl normal propylacetylene.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) A hydrocarbon, C6H10, of the acetylene series, obtained artificially as a colorless, volatile, pungent liquid; -- called also hexoylene.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun organic chemistry A hydrocarbon, C6H10, of the acetylene series; hexoylene.