n. — Atlantic Canada, Food, Fauna
a large clam with a corrugated shell found on underwater sandbars (see Image 1).
Type: 5. Frequency — The bar clam is also known as the Atlantic surf clam. The term bar clam is most prevalent in Canada when compared with other countries through internet domain searches (see Chart 1). Bar clam is listed in DPEIE and marked "common" (see DPEIE, s.v. "bar clam"). Casselman (1998: 57) also lists the term as from Prince Edward Island, though quotations demonstrate that the term is also used in other Maritime provinces, such as New Brunswick (see, e.g. the 2013 quotation).
See also COD-2, s.v. "bar clam", which is marked "Cdn".
Images:

Image 1: Canned bar clams. Photo: B. Ford
Chart 1: Internet Domain Search, 29 Oct. 2013