Noun
a stop consonant articulated by releasing pressure at the glottis; as in the sudden onset of a vowel
Source: WordNetA glottal stop is made during the hold of the click; the (necessarily voiceless) click is released, and then the glottal hold is released into the vowel. Source: Internet
Few languages make a phonemic distinction between a word beginning with a vowel and a word beginning with a glottal stop followed by a vowel, since the distinction will generally only be audible following another word. Source: Internet
For example, a glottal stop does not occur in other situations in German, e.g. before a consonant or at the end of word. Source: Internet
For example, standard German (excluding many southern accents) and Arabic both require that a glottal stop be inserted between a word and a following, putatively vowel-initial word. Source: Internet
Furthermore, an apostrophe may be used to indicate a glottal stop in transliterations. Source: Internet
However, this glottal stop undergoes sandhi whenever followed by consonant, or more often than not (see below). Source: Internet