deciduous

/dɪˈsɪd͡ʒ.u.əs/adjective

deciduous is spelled D-E-C-I-D-U-O-U-S: 9 letters and 4 syllables. It appears 1.0 times per million words in written English, the 28,556th most frequent word form (wordfreq, 2021 data). As an adjective, deciduous means “Describing a part that falls off, or is shed, at a particular time or stage of development” (English Wiktionary, September 2026).

How many letters and syllables are in deciduous?

Letters	9: D-E-C-I-D-U-O-U-S
Syllables	4 (from its American pronunciation)
In writing	1.0 times per million words; the 28,556th most frequent word form
Wrong spellings searched	none measured in search
Rhymes with	assiduous

Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); rhymes and same-letter words are computed by PlainSpell from its own word list.

How common is deciduous?

Deciduous appears 1.0 times per million words in written English, the 28,556th most frequent word form in the list.

deciduous0.0010.010.11101001,00010,000

rarerper million words of written Englishmore common

Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).

How do you pronounce deciduous?

UK /dɪˈsɪd͡ʒ.ʊ.əs/
US /dɪˈsɪd͡ʒ.u.əs/

Deciduous has 4 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-us-deciduous.ogg, En-au-deciduous.ogg, Wikimedia Commons (author and licence on each file's page).

What rhymes with deciduous?

One word on PlainSpell end in the same sounds as deciduous from its last stressed vowel (/ɪdʒuəs/):

assiduous

Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).

What does deciduous mean?

The meanings the English Wiktionary records, quoted as written there (source below).

adjective

1
Describing a part that falls off, or is shed, at a particular time or stage of development.
2
Of or pertaining to trees which lose their leaves in winter or the dry season.
. Compare caducous.
3
Transitory, ephemeral, not lasting.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

Deciduous in Spanish, French, German and Portuguese

Language	Words
French	caduc, décidual (describing a part that falls off, or is shed), à feuilles caduques, caducifolié (of or pertaining to trees which lose their…)
Portuguese	caduco, decíduo (describing a part that falls off, or is shed), caducifólio (of or pertaining to trees which lose their…), efêmero, transitório (transitory, ephemeral, not lasting)
Spanish	caduco, deciduo (describing a part that falls off, or is shed), caducifolio, de hoja caduca (of or pertaining to trees which lose their…), efímero, transitorio (transitory, ephemeral, not lasting)
German	Laub, laubabwerfend, sommergrün (of or pertaining to trees which lose their…)

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.

Where does deciduous come from?

Learned borrowing from Latin dēciduus (“falling down or off”), from dēcidō (“to fall down or off”) + -uus.