gustofacial en · ADJ
Etymology
From Latin gustus (“a tasting”), and facial.
Meanings
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(not-comparable) Of or relating to a basic reflex where different tastes produce different reactions in young children.
In the gustofacial reflex, sweet tastes evoke a smile, bitter tastes produce a look of disgust and sticking out of the tongue, while sour tastes make the newborn purse its lips.
1993, Richard Cytowic, The Man Who Tasted Shapes: