Fold of Skin Between Tongue and Gum
Puzzle 5 of Prestigious Universities Medium Pack
Question is: Fold of Skin Between Tongue and Gum
and the answer is: FRENULUM
Word Meaning:
FRENULUM — (anatomy) A small fold or ridge of tissue that supports or restrains the motion of the part to which it is attached, in particular a fold of skin beneath the tongue, or between the lip and the gum.
Definitions from Wiktionary.