Consonantal refers to sounds made by obstructing air flow in the vocal tract. The 't' in 'tap' represents a consonantal stop.
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Speech Patterns
A consonantal cluster forms when two or more consonants are spoken together without vowels between them. In 'straight', 'str' is a consonantal cluster.
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Linguistic Contrast
Knowing what is consonantal helps distinguish these sounds from vowels, fundamental in understanding phonetics. In phonetics, a consonantal sound like 'm' contrasts with the vowel sound 'a'.