carbyne

Noun

 * 1) The trivalent radical R-C&#x22ee; or any of its hydrocarbyl derivatives.
 * 2) The linear carbon allotrope, composed of alternating (1) triple and single bonds [ ...–C&#x2261;C–C&#x2261;C–... ] or (2) double bonds [ ...=C=C=C=... ].
 * 3) Linear acetylenic carbon, a form of the linear carbon allotrope consisting of the form with alternating single- and triple-bonded carbons [ ...–C&#x2261;C–C&#x2261;C–... ].

Coordinate terms

 * / buckytube
 * / buckytube
 * / buckytube
 * / buckytube