say it: AWL-dur
alder is a noun meaning "wood of any of various alder trees; resistant to underwater rot; used for bridges etc". It carries 2 recorded senses.
wood of any of various alder trees; resistant to underwater rot; used for bridges etc
north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the wood is rot-resistant
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for alder come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.