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[awl-der] /ˈɔl dər/
any shrub or tree belonging to the genus Alnus, of the birch family, growing in moist places in northern temperate or colder regions and having toothed, simple leaves and flowers in catkins.
any of various trees or shrubs resembling an alder.
Origin of alder
before 900; Middle English alder, aller, Old English alor, al(e)r; cognate with Old Norse ǫlr, Middle Low German al(l)er < Germanic *álusṓ; akin to Middle High German alze < Germanic *alū́sō, Old High German elira, erila (German Erle) < Germanic *álisṓ, Middle Low German els(e) < Germanic *alísō, hence Germanic *álus, alísō; compare Polish olcha, Russian olʾkhá < Indo-European dialect *alisā; Lithuanian al̃ksnis, Latin alnus < Indo-European dialect *alsnos


[ahl-der; German ahl-duh r] /ˌɑl dər; German ˈɑl dər/
Kurt [kurt;; German koo rt] /kɜrt;; German kʊərt/ (Show IPA), 1902–58, German chemist: Nobel Prize 1950. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for alder
Contemporary Examples
Historical Examples
  • They have been down all the morning at the pool where the alder is, trying to catch that bull-trout.'

    Echoes of the War J. M. Barrie
  • I wouldn't go down by the stream, Barbara—not to the pool where the alder is.

    Echoes of the War J. M. Barrie
  • Ellen, I think I should like to have that alder tree cut down.

    Echoes of the War J. M. Barrie
  • Mr. alder is on other business that he had to attend to at the editor's request.

  • alder makes a fine sweet smoke, but we didn't have any alder, up here.

    Pluck on the Long Trail

    Edwin L. Sabin
  • The bark and twigs of alder are used for dyeing brown and black.

    Vegetable Dyes

    Ethel M. Mairet
  • Dr. alder appeared delighted and thankful beyond expression.

    The Story of My Life Egerton Ryerson
  • Not at all,” he said, laughing; “that alder twig did for me.

    A Young Man in a Hurry Robert W. Chambers
  • Here they planted the alder; and Thule brought water, and moistened the roots.

    Fairy Book Sophie May
British Dictionary definitions for alder


any N temperate betulaceous shrub or tree of the genus Alnus, having toothed leaves and conelike fruits. The bark is used in dyeing and tanning and the wood for bridges, etc because it resists underwater rot
any of several similar trees or shrubs
Word Origin
Old English alor; related to Old High German elira, Latin alnus
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for alder

tree related to the birch, Old English alor "alder" (with intrusive -d- added 14c.; the historical form aller survived until 18c. in literary English and persists in dialects, e.g. Lancashire owler, which is partly from Norse), from Proto-Germanic *aliso (cf. Old Norse ölr, Danish elle, Swedish al, Dutch els, German erle), from *el-, the ancient PIE name of the tree (cf. Russian olicha, Polish olcha, Latin alnus, Lithuanian alksnis).

Online Etymology Dictionary, © 2010 Douglas Harper
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alder in Medicine

Alder Al·der (äl'dər), Kurt. 1902-1958.

German chemist. He shared a 1950 Nobel Prize for discoveries concerning the structure of organic matter.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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