angle, 85 angle of optical rotation, , 86 angle strain, 86 ångström , 86 angular distribution, 86 angular frequency, , 86 angular momentum, , 87 angular overlap model (AOM), 87 anhydrides, 87anhydro bases, 87 anilides, 88 anils, 88 anion, 88 anion exchange, 88 anion exchanger, 88 anion-exchange polymer, 89 anionic polymer, 89 anionic polymerization, 89 anionotropic rearrangement (or anionotropy), 89 anisotropy, 89 annelation, 90 annihilation, 90 annulation, 90 annulenes, 90 annulenylidenes, 91 anode, 91 anodic transfer coefficient, 91 anomeric effect, 91 anomers, 92 ansa compounds, 92 antagonism, 93 antagonist, 93 antarafacial, 93 anthelmint(h)ic, 95 anthocyanidins, 95 anthocyanins, 95 anti, 95 anti-Compton γ-ray spectrometer, 97 anti-Hammond effect, 97 anti-Stokes type radiation (fluorescence), 97 anti-thixotropy, 97 antiaromatic compounds, 97 antiaromaticity (antithetical to aromaticity), 98 antibiotic, 98 antibody, 98 antibonding molecular orbital, 98 anticholinergic, 99 anticircular elution (anticircular development) in planar chromatography , 99 anticlined structures in polymers, 99 anticodon, 99 anticyclone in atmospheric chemistry , 99 antiferromagnetic transition, 99 antigen, 100 antimetabolite, 100 antimony–xenon lamp (arc), 100 antimycotic, 100 antiparticle, 100 antipodes [obsolete] , 101antiprismo- , 101 antiresistant, 101 antiserum, 101 antisymmetry principle, 101 ap, 102 apex current, 102 aphicide, 102 apical (basal, equatorial), 102 apicophilicity, 103 apo- in carotenoid nomenclature , 103 apoenzyme, 103 apoprotein, 103 apoptosis, 104 apparent lifetime, 104 apparent (quantity), 104 apparent viscosity of a liquid , 104 appearance energy (appearance potential), 104 appearance potential [obsolete] , 105 appearance temperature, in electrothermal atomization , 105 applied potential, 105 aprotic (solvent), 105 aquagel, 106 aquation, 106 arachno- , 106 Archibald’s method, 106 area of an electrode-solution interface , 106 area of interface, 107 areic, 107 arene epoxides, 107 arene oxides, 107 arenes, 108 arenium ions, 108 arenols, 108 arenonium ions [obsolete] , 109 argon ion laser, 109 arithmetic mean (average), 109 aromatic, 109 aromatic photocycloaddition, 110 aromaticity, 110 arrester in atmospheric chemistry , 111