Sponge Construction definition in Computer Security terms:
Definition(s): The method originally specified in G. Bertoni, J. Daemen, M. Peeters, and G. Van Assche, Cryptographic sponge functions, January 2011, for defining a function from the following: 1) an underlying function on bit strings of a fixed length, 2) a padding rule, and 3) a rate. Both the input and the output of the resulting function are bit strings that can be arbitrarily long.
Source(s): FIPS 202
reference: CSRC Glossary