Definition of Savoy biscuit in US English:

Savoy biscuit

noun

  • A kind of sponge biscuit, made by squeezing the sponge mixture through a piping bag into short, finger-shaped sections, and coating with sifted sugar before baking, and which is typically incorporated into desserts such as trifle and tiramisu; a sponge finger.

Origin

Early 18th century.