The Collaborative International Dictionary of English v.0.48:
Nantua \Nantua\ n. (Cookery) A white sauce with whipping cream and shrimp butter. Syn: shrimp sauce. [WordNet 1.5]WordNet (r) 3.0 (2006):
Nantua n 1: white sauce with whipping cream and shrimp butter [syn: Nantua, shrimp sauce]