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Levorotation : ウィキペディア英語版
Dextrorotation and levorotation
Dextrorotation and levorotation (also spelled as laevorotation)〔The first word component ''dextro-'' comes from Latin word for dexter "right (as opposed to left)". Laevo- or levo- comes from the Latin for laevus, "left side."〕 refer to the properties of rotating plane polarized light. If the light rotates clockwise as it approaches an observer, this is known as dextrorotation, or light with a rotation to the right. If the light rotates counterclockwise as it approaches the observer, then the light exhibits levorotation, or rotation to the left.
A compound with dextrorotation is called dextrorotatory or dextrorotary, while a compound with levorotation is called levorotatory or levorotary.〔 Compounds with these properties are said to have optical activity and consist of chiral molecules. If a chiral molecule is dextrorotary, its enantiomer (geometric mirror image) will be levorotary, and vice versa. In fact, the enantiomers will rotate plane polarized light the same number of degrees, but in opposite directions.
Apart from direct measurement of the optical rotation of an actual sample, it is only possible to determine whether a given chiral molecule will be levorotatory or dextrorotatory, directly from its absolute configuration, via detailed computer modeling.〔See, for example,〕 That is to say, both "R" and "S" stereocenters have the ability to be dextrorotatory or levorotatory.
==Chirality prefixes==
(詳細はウィキペディア(Wikipedia)

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