A voiceless velar implosive is a very rare consonantal sound. The symbol for this sound in the International Phonetic Alphabet is ⟨ɠ̊⟩ or ⟨kʼ↓⟩. A dedicated IPA letter, ⟨ƙ⟩, was withdrawn in 1993.
Features
Features of the voiceless velar implosive:
Its
occlusive, which means it is produced by obstructing airflow in the vocal tract. Since the consonant is also oral, with no nasal outlet, the airflow is blocked entirely, and the consonant is a plosive
Its phonation is voiceless, which means it is produced without vibrations of the vocal cords.
It is an oral consonant, which means air is allowed to escape through the mouth only.
It is a central consonant, which means it is produced by directing the airstream along the center of the tongue, rather than to the sides.
The airstream mechanism is implosive (glottalic ingressive), which means it is produced by pulling air in by pumping the glottis downward. As it is voiceless, the glottis is completely closed, and there is no pulmonic airstream at all.
Occurrence
A phonemic /ɠ̊/ has not been confirmed for any language. It has been claimed for
glug-glug" sound of liquid being poured from a bottle, though others use a voiced implosive [ɠ] or an uvular one [ʛ].[1][full citation needed
]
In Uspantek, and perhaps other Mayan languages of Guatemala, [ɠ̊] is a rare allophone of /kˀ/. Of the consonants with glottalic airstream, the labial and uvular vary as [ɓ̥] ~ [pʼ] and [ʛ̥] ~ [qʼ], depending on the position in the word. In contrast, the velar is nearly always [kʼ], but speakers have been recorded using [ɠ̊].[2]
