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Achiral  -  As opposed to chiral, a term referring to an object that is superimposable on (identical to) its mirror image.
Chiral  -  An object that is not superimposable on its mirror image; opposite of achiral.
Cumulated diene (allene)  -  A molecule that contains the motif C=C=C, where the central carbon atom is attached to two perpendicular Π bonds.
Conformational enantiomers  -  Conformations of a single molecule that are non-superimposable mirror images.
Diastereomer  -  Stereoisomers that are not enantiomers.
Enantiomer  -  Stereoisomers that are non-superimposable mirror images.
Fischer Projection  -  Representation of chirality using a cross, with the horizontal lines representing bonds coming out of the plane of the page and vertical line representing bonds going into the plane of the page.
Meso  -  A compound that contains multiple stereocenters but is achiral due to an internal plane of symmetry.
Stereocenter  -  Short for stereogenic center. A component of a molecule that gives rise to stereoisomerism. Often a carbon atom attached to four distinct groups.