from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Shedding or losing foliage at the end of the growing season.
  • adjective Falling off or shed at a specific season or stage of growth.
  • adjective Of or relating to the primary teeth.

from The Century Dictionary.

  • Falling or liable to fall, especially after a definite period of time; not perennial or permanent.
  • Specifically— In botany: Falling off at maturity or at the end of the season, as petals, leaves, fruit, etc.: in distinction from fugacious or caducous organs, which fall soon after their appearance, and from persistent or permanent, or, as applied to leaves, from evergreen. Losing the foliage every year: as, deciduous trees.
  • In zoology: Falling off at a certain stage of an animal's existence, as the hair, horns, and teeth of certain animals. Losing certain parts regularly and periodically, or at certain stages or ages: as, a deciduous insect.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective (Biol.) Falling off, or subject to fall or be shed, at a certain season, or a certain stage or interval of growth, as leaves (except of evergreens) in autumn, or as parts of animals, such as hair, teeth, antlers, etc.; also, shedding leaves or parts at certain seasons, stages, or intervals

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective biology Describing a part that falls off, or is shed, at a particular time or stage of development.
  • adjective botany Of or pertaining to trees which lose their leaves in winter or the dry season.
  • adjective transitory, ephemeral, not lasting

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective (of plants and shrubs) shedding foliage at the end of the growing season
  • adjective (of teeth, antlers, etc.) being shed at the end of a period of growth


from The American Heritage® Dictionary of the English Language, 4th Edition

[From Latin dēciduus, from dēcidere, to fall off : dē-, de- + cadere, to fall; see kad- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin dēciduus ("falling down or off"), from dēcidō ("fall down")


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  • Since the rate of decomposition is higher in deciduous than in coniferous forests nitrogen is probably more available in deciduous forests, further increasing production(dictionary)

    September 23, 2010