surface form
Definition - The phonetic expression of the underlying phonemic form. In other words, what you say when you actually speak the underlying form that your mind wants to say.

Example -
In American English the underlying phoneme /t/ in a word like wet (/wɛt/) can surface either as a glottalized [tˀ] or as a flap [ɾ], depending on environment, thus resulting in the spoken surface forms [ˈwɛtˀ] wet or [ˈwɛɾɚ] wetter.

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