deciduous

adjective

de·​cid·​u·​ous di-ˈsi-jə-wəs 

-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

Synonyms of deciduous

• temporary
• flash
• brief
• transient
• passing
• ephemeral
• transitory

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

Overall, top candidates for bare-root planting include deciduous fruit trees, roses, berry bushes, and hardy perennials, as these plants handle winter dormancy exceptionally well. — Sj McShane, Martha Stewart, 16 Sep. 2026

This native tree is a deciduous conifer with feathery foliage that turns a beautiful rusty orange in fall. — Arricca Elin Sansone, Southern Living, 12 Sep. 2026

This fast-growing, deciduous shrub is adaptable and durable, thriving in USDA Zones 5 to 8. — Lee Wallender, The Spruce, 10 Sep. 2026

Here, ferns, mosses, and coniferous and deciduous species work seamlessly to paint Hoh Rain Forest all hues of green. — Stephanie Vermillion, Travel + Leisure, 21 Aug. 2026

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

Phrases Containing deciduous

• deciduous tooth

Kids Definition

deciduous

adjective

de·​cid·​u·​ous di-ˈsij-ə-wəs 

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 

1

: falling off or shed at a certain stage in the life cycle

2

: having deciduous parts

a deciduous dentition