diffusion
Pronounceddihf-YOO-zhuhn
When something spreads out and mixes into the air or space around it, like when perfume spreads through a room.
Syllables
3 syllables
Letters
Phonics breakdown
Phonics Rule: Letter D
Sound“d”·/d/
The letter D makes the /d/ sound, like in 'dog', 'day', and 'dig'. The tongue tip touches behind the upper teeth.
D is a voiced alveolar stop. The tongue tip touches the ridge just behind the upper front teeth, then releases with voice. It reliably makes the /d/ sound in almost all positions.
Tip
D is for dog — and dog starts with /d/!
Examples
When the letter I appears in a closed syllable, it usually makes the short I sound “ih”. This is one of the trickiest short vowels because it sounds similar to short E.
Tip
I says “ih” like an itch you can't miss.
Examples
Phonics Rule: Double Consonant
Sound“one sound”
Two of the same consonant together make just one sound, like the LL in 'ball' or TT in 'butter'.
When two identical consonants appear together, they make just one consonant sound, and the doubling signals a short vowel before it. A common case is the FLOSS rule: a one-syllable word with a short vowel doubles a final f, l, s, or z (off, ball, miss, buzz). Examples: ball, butter, happy, mitten, egg, off.
Tip
Double consonants make one sound — ball, butter, egg!
Examples
Phonics Rule: Open Syllable U — “yoo” (Long U)
Sound“yoo”·/juː/
When U is the last letter of a syllable, the syllable is open and the U says its name with a /j/ glide — like in 'mu-sic' and 'hu-man'.
This is the open-syllable pattern: a syllable that ends in a vowel leaves it 'open', so it says its long name. Here, a lone U at the end of a syllable says “yoo” (mu-sic, hu-man, u-nit). After L, R, S, or J the Y-glide drops and U says “oo” instead — see the companion Open Syllable U (“oo”) rule.
Tip
Long U says its name with a YOO sound!
Examples
Phonics Rule: Suffix -SION (“zhun”)
Sound“zhun”·/ʒən/
After a vowel, -SION buzzes to “zhun”, like in 'vision' and 'division'.
When -SION follows a vowel, it makes the voiced “zhun” sound: vision, division, confusion, explosion, invasion. (After a consonant it says “shun” instead — mission, tension — see the companion rule.)
Tip
-SION after a vowel buzzes — a vision of division!
Examples
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