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1. Oxford American Dictionary

   alder

   • IPA[ˈôldər]

   美式

   • n.
     a widely distributed tree of the birch family which has toothed leaves and bears male catkins and woody female cones.

   • noun: alder, plural noun: alders

2. • 相關詞

   alder buckthorn

   • n.
     a deciduous Eurasian shrub which bears glossy leaves and black berries.

   Oxford Dictionary

   Diels–Alder reaction

   • n.
     an addition reaction in which a conjugated diene reacts with a compound with a double or triple ...

   Oxford American Dictionary

   Diels–Alder reaction

   • n.
     an addition reaction in which a conjugated diene reacts with a compound with a double or triple ...

   Oxford Dictionary

3. • 更多解釋

   alder

   • IPA[ˈɔːldə]

   英式

   • n.
     a widely distributed tree of the birch family which has toothed leaves and bears male catkins ...

   Oxford Dictionary