• WordNet 3.6
    • adj fiddle-shaped (of a leaf shape) having rounded ends and a contracted center
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Webster's Revised Unabridged Dictionary
    • a Fiddle-shaped (Bot) Inversely ovate, with a deep hollow on each side.
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Century Dictionary and Cyclopedia
    • fiddle-shaped Having the form of a fiddle or violin; pandurate or panduriform: applied in botany to an obovate leaf which is contracted above the base.
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In literature:

The crabs bore fiddles of all sorts and shapes in their claws, and one big fellow carried a leader's baton.
"The Sea Fairies" by L. Frank Baum
The Performer nearest them was running a slow bass scale on a sort of two-stringed horse-fiddle of a strange shape.
"Average Jones" by Samuel Hopkins Adams