deciduous

adjective

de·​cid·​u·​ous di-ˈsi-jə-wəs How to pronounce deciduous (audio)
-jü-əs
1
biology : falling off or shed seasonally or at a certain stage of development in the life cycle
deciduous leaves
deciduous scales
2
biology
a
: having deciduous parts
maples, birches, and other deciduous trees
deciduous dentition
b
: having the dominant plants deciduous
a deciduous forest
3
: ephemeral
There is much that is deciduous in books …J. R. Lowell
deciduousness noun

Examples of deciduous in a Sentence

the bare branches of a deciduous tree in winter he chose not to fret about the deciduous discomforts of his existence
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
In full shade this deciduous shrub typically produces fewer flowers. Arricca Elin Sansone, Southern Living, 8 Oct. 2025 This zone is characterized by deciduous trees such as dogwood, alder, and aspen surrounded by conifer forest. Worth Matthewson, Outdoor Life, 2 Oct. 2025 Most spring bulbs thrive where the deciduous tree canopy lets in enough sunlight for the bulbs to bloom and the soil doesn't stay overly wet. Erica Browne Grivas, Better Homes & Gardens, 27 Sep. 2025 As temperatures drop, nearby groves of aspen, willow, cottonwood, and other deciduous trees turn into a brilliant display of scarlet, gold, and orange. Cu Fleshman, Travel + Leisure, 21 Sep. 2025 See All Example Sentences for deciduous

Word History

Etymology

Latin deciduus, from decidere to fall off, from de- + cadere to fall — more at chance

First Known Use

1657, in the meaning defined at sense 1

Time Traveler
The first known use of deciduous was in 1657

Browse Nearby Words

Cite this Entry

“Deciduous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/deciduous. Accessed 9 Oct. 2025.

Kids Definition

deciduous

adjective
de·​cid·​u·​ous di-ˈsij-ə-wəs How to pronounce deciduous (audio)
1
: falling off (as at the end of a growing period or stage of development)
antlers are deciduous
deciduous leaves
2
: having deciduous parts or members with deciduous parts
deciduous trees
a deciduous forest

Medical Definition

deciduous

adjective
de·​cid·​u·​ous di-ˈsij-ə-wəs How to pronounce deciduous (audio)
1
: falling off or shed at a certain stage in the life cycle
2
: having deciduous parts
a deciduous dentition

More from Merriam-Webster on deciduous

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