Definition - Pertaining to the tip of the tongue and the sounds made with it, e.g. the [t] in touch.

Etymology -
The word derives from the Latin apex or apicis, a point.

Oxford English Dictionary -
Its first citation in this sense is from 1899:
"The part of the tongue which helps to form the narrowing is the front rim. The front rim of the tongue: apical formation."
(Rippmann Elem. Phonet. 71)

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