Definition of pyran in English:

pyran

(also pyrane)

noun ˈpʌɪran

Chemistry

Each of two unsaturated, heterocyclic compounds having the formula C₅H₆O, whose molecules have a six-membered ring consisting of five carbon atoms and one oxygen atom with two double bonds between carbon atoms; specifically γ-pyran. Also: a substituted derivative of such a compound; any compound containing a pyran ring.

Early 20th century; earliest use found in Journal of the Chemical Society. From pyr- + -an.

(also pyrane)

nounˈpʌɪran

Chemistry

Each of two unsaturated, heterocyclic compounds having the formula C₅H₆O, whose molecules have a six-membered ring consisting of five carbon atoms and one oxygen atom with two double bonds between carbon atoms; specifically γ-pyran. Also: a substituted derivative of such a compound; any compound containing a pyran ring.

Early 20th century; earliest use found in Journal of the Chemical Society. From pyr- + -an.

词汇	pyran
释义	Definition of pyran in English: pyran (also pyrane) noun ˈpʌɪran Chemistry Each of two unsaturated, heterocyclic compounds having the formula C₅H₆O, whose molecules have a six-membered ring consisting of five carbon atoms and one oxygen atom with two double bonds between carbon atoms; specifically γ-pyran. Also: a substituted derivative of such a compound; any compound containing a pyran ring. Origin Early 20th century; earliest use found in Journal of the Chemical Society. From pyr- + -an. Definition of pyran in US English: pyran (also pyrane) nounˈpʌɪran Chemistry Each of two unsaturated, heterocyclic compounds having the formula C₅H₆O, whose molecules have a six-membered ring consisting of five carbon atoms and one oxygen atom with two double bonds between carbon atoms; specifically γ-pyran. Also: a substituted derivative of such a compound; any compound containing a pyran ring. Origin Early 20th century; earliest use found in Journal of the Chemical Society. From pyr- + -an.
随便看	haulms haul off haul off haul oneself haul oneself haul (or drag or tear) ass haul (or drag or tear) ass haul out haul out haul over the coals hauls haul sb over the coals haul somebody over the coals haul someone over the coals haul someone over the coals haul up haul video haunch haunch-bone haunched haunches haunching haunt haunt-dole haunted