Noun alder has 2 senses
  1. alder - wood of any of various alder trees; resistant to underwater rot; used for bridges etc
    --1 is a kind of
    wood
    --1 is a substance of alder, alder tree
  2. alder, alder tree - north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the rot-resistant wood
    --2 is a kind of tree
    --2 is a member of Alnus, genus Alnus
    --2 has substances: alder
    --2 has particulars:
     common alder, European black alder, Alnus glutinosa, Alnus vulgaris; gray alder, Alnus incana; seaside alder, Alnus maritima; white alder, mountain alder, Alnus rhombifolia; red alder, Oregon alder, Alnus rubra; speckled alder, Alnus rugosa; smooth alder, hazel alder, Alnus serrulata; green alder, Alnus veridis; green alder, Alnus veridis crispa, Alnus crispa
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