IPA: //poʊstˈvoʊkəlɪk//
KK: /ˈpoʊstˌvoʊkəlɪk/
Referring to a consonant sound that comes right after a vowel in a word.
In the word 'cat', the letter 't' is a postvocalic consonant.
Postvocalic → It is formed from "post-" (meaning after) and "vocalic" (from Latin "vocalis", meaning vocal or relating to the voice). The term refers to sounds that occur after a vowel in a word.
Think of 'post-' meaning 'after' and 'vocalic' relating to 'voice' or 'vowel' — so postvocalic refers to sounds that come after a vowel.