| Alder (n.) A tree, usually growing in moist land, and belonging to the genus Alnus. The wood is used by turners, etc. |
| Alder (a.) Alt. of Aller |
| Alder-liefest (a.) Most beloved. |
| woolly alder aphid / Prociphilus tessellatus attacks alders |
| alderfly / alder fly / Sialis lutaria darkolored insect having predaceous aquatic larvae |
| Clethraceae / family Clethraceae / white-alder family coextensive with the genus Clethra |
| sweet pepperbush / pepper bush / summer sweet / white alder Clethra alnifolia shrub of eastern and southern coastal United States having beautiful racemes of spice-scented white flowers |
| alder / alder tree north temperate shrubs or trees having toothed leaves and conelike fruit, bark is used in tanning and dyeing and the wood is rotesistant |
| alder wood of any of various alder trees, resistant to underwater rot, used for bridges etc |
| common alder / European black alder / Alnus glutinosa / Alnus vulgaris medium-sized tree with brown-black bark and woody fruiting catkins, leaves are hairy beneath |
| grey alder / gray alder / Alnus incana native to Europe but introduced in America |
| seaside alder / Alnus maritima shrub or small tree of southeastern United States having soft light brown wood |
| white alder mountain alder Alnus rhombifolia tree of western United States |