A tree native to much of Europe and neighboring Africa and Asia (Alnus glutinosa).

A tree in the genus Alnus; Alnus rubra. / A South African tree Cunonia capensis

A tree in the genus Alnus; Alnus incana.

A tree in the genus Alnus; Alnus viridis.

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

(organic chemistry) Any of four isomeric aliphatic alcohols derived from butane; butanol

(organic chemistry) The aliphatic alcohol 2-propanol that is used as a solvent and in many industrial applications.

(organic chemistry) A sugar alcohol in which one on more hydroxy groups have been replaced by hydrogen

(organic chemistry) 1-dodecanol

(organic chemistry) The waxy aliphatic primary alcohol 1-hexadecanol, used in cosmetics etc.