apertures
Pronouncedapertures
nounSmall or narrow openings, gaps, slits, or holes.
nounHoles in optical equipment that control how much light can pass through.
nounThe sizes of the holes in telescopes and cameras that control how much light enters.
Syllables
3 syllables
Letters
Phonics breakdown
When the letter A appears in a closed syllable (a syllable that ends with a consonant), it usually makes the short A sound “a”. This is one of the first vowel sounds students learn.
Tip
A says “a” like a cat that sat on a mat.
Examples
Phonics Rule: Letter P
Sound“p”·/p/
The letter P makes the /p/ sound, like in 'pan', 'pig', and 'pot'. Both lips press together then pop open.
P is a voiceless bilabial stop — both lips press together and release with a puff of air but no voice. It pairs with B (which is the voiced version of the same mouth position).
Tip
P pops open — press your lips and let it POP!
Examples
Phonics Rule: R-Controlled ER
Sound“er”·/ɜːr/
When R comes after E, it makes the “er” sound, like in 'her' and 'fern'.
ER makes the same sound as IR and UR — they all say “er”. ER is the most common spelling of this sound, especially at the end of words.
Tip
ER, IR, and UR all sound the same — Bossy R wins again!
Examples
Phonics Rule: Letter T
Sound“t”·/t/
The letter T makes the /t/ sound, like in 'top', 'tap', and 'ten'. The tongue tip taps behind the upper teeth.
T is a voiceless alveolar stop. The tongue tip touches the ridge behind the upper teeth and releases with a puff of air. Double T (tt) makes the same /t/ sound.
Tip
T taps — touch your tongue to make /t/!
Examples
Phonics Rule: R-Controlled UR
Sound“er”·/ɜːr/
When R comes after U, it makes the “er” sound, like in 'turn' and 'burn'.
UR makes the same “er” sound as ER and IR. It's the least common of the three spellings.
Tip
The nurse with fur says “er”!
Examples
Phonics Rule: Plural -S (/z/ sound)
Sound“z”·/z/
After a buzzing sound or a vowel, the plural ending says /z/ — like 'dogs' and 'shoes'.
Put a finger on your throat and say 'zzzz' — you feel a buzz. When the word ends in a buzzing (voiced) sound or a vowel, the plural ending buzzes too and says /z/. This happens whether the word is spelled -s (dogs) or -es (shoes, trees), because in shoes the e is silent and only the s is sounded. Most people never notice they are doing this.
Examples
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