(countable, uncountable) A tree (Alnus glutinosa), of many practical uses, growing in moist conditions in Europe. / (uncountable) Wood or other product of the tree.

plural of alder buckthorn

A deciduous shrub, Frangula alnus, native to Europe and neighboring areas of Asia and Africa, bearing glossy leaves, flowers in sessile umbels, and inedible red berries that turn black when ripe, and historically used as a laxative and to produce dyes.

plural of Diels-Alder reaction

A deciduous holly shrub, Ilex verticillata, native to eastern North America, growing best in moist circumstances.

(organic chemistry) The cycloaddition reaction between a conjugated diene and an alkene to form a cyclohexene ring.

plural of black alder

plural of common alder

plural of brook alder

plural of white alder