File:Retroflex.svg · Wikimedia Commons · See Wikimedia Commons
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Encyclopedic overview
Subapical retroflex plosive
A retroflex (/ˈrɛtrəflɛks, -roʊ-/ ) consonant is a coronal consonant where the tongue has a flat, concave, or even curled shape, and is articulated between the alveolar ridge and the hard palate. They are sometimes referred to as cerebral consonants—especially in Indology. Other terms are domal and cacuminal (/kəˈkjuːmɪnəl/ ), though in rare cases either word can mean palatal consonants more broadly.
Excerpted from Wikipedia’s “retroflex consonant” article, available under the CC BY-SA 4.0 licence.