Webster's 1828 Dictionary
TONGUE-SHAPED, TUNG-SHAPED
a.In botany, a tongue-shaped leaf, is linear and fleshy, blunt at the end, convex underneath, and having usually a cartilaginous border.
Webster's 1913 Dictionary
TONGUE-SHAPED
TONGUE-SHAPED Tongue "-shaped `, a.
Defn: Shaped like a tongue; specifically (Bot. ), linear or oblong, and fleshy, blunt at the end, and convex beneath; as, a tongue-shaped leaf.