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Frankfurt an der Oder

(Encyclopedia)Frankfurt an der Oder än dĕr ōˈdər [key], city, Brandenburg, E Germany, a port on the Oder River, at the ...

Mülheim an der Ruhr

(Encyclopedia)Mülheim an der Ruhr mülˈhīm än dĕr ro͞or [key] or Mülheim, city (1994 pop. 177,175), North Rhine–Westphalia, W Germany, on the Ruhr River. It is an industrial center of the Ruhr district and...

Neustadt an der Weinstrasse

(Encyclopedia)Neustadt an der Weinstrasse noiˈshtät än dĕr vīnˈshträsə [key], city (1994 pop. 53,782), Rhineland-Palatinate, SW Germany; chartered 1275. It is the center of the Rhenish Palatinate wine trade...

Marburg an der Lahn

(Encyclopedia)Marburg an der Lahn märˈbo͝ork än dĕr län [key] or Marburg, city (1994 pop. 76,582), Hesse, Germany, on the Lahn River. It is chiefly known for its Protestant university, founded in 1527 by Phil...

Landsberg an der Warthe

(Encyclopedia)Landsberg an der Warthe: see Gorzów Wielkopolski, Poland. ...

Bruck an der Mur

(Encyclopedia)Bruck an der Mur bro͝ok än dĕr mo͞or [key], city, in Styria prov., E central Austria, at the confluence of the ...

trisection of an angle

(Encyclopedia)trisection of an angle: see geometric problems of antiquity. ...

saturation, of an organic compound

(Encyclopedia)saturation, of an organic compound, condition occurring when its molecules contain no double or triple bonds and thus cannot undergo addition reactions. For example, ethane (H3C–CH3) is a saturated ...

amino group

(Encyclopedia)amino group, in chemistry, functional group that consists of a nitrogen atom attached by single bonds to hydrogen atoms, alkyl groups, aryl groups, or a combination of these three. An organic compound...

Nola

(Encyclopedia)Nola nôˈlä [key], town (1991 pop. 32,613), in Campania, S Italy. It is an agricultural center with food-processing industries. An Etruscan stronghold as early as 500 b.c., Nola flourished after pas...