The Collaborative International Dictionary
Soda biscuit
Soda biscuit \So"da biscuit\, n. a bicuit leavened with baking soda and with buttermilk or sour milk.
Wiktionary
soda biscuit
n. a biscuit (cookie), having a breadlike consistency, leavened with soda and buttermilk
WordNet
soda biscuit
n. very tender biscuit partially leavened with buttermilk and soda [syn: buttermilk biscuit]
Usage examples of "soda biscuit".
I learned long ago, from you, Ramsay, that it's no use asking questions of a Scot when he speaks like that -- dry as an old soda biscuit.