any of the 14 to 16 species of diving ducks of the tribe Aythyini (family Anatidae, order Anseriformes), often called bay ducks. Found on http://www.britannica.com/eb/a-z/p/82
The USS Pochard was an American Auk Class minesweeper of 890 tons displacement launched in 1944. The USS Pochard was powered by diesel engines providing a top speed of 18 knots and carried a complement of 105. She was armed with one 3 inch dual-purpose gun and two 40 mm anti-aircraft guns. Found on http://www.probertencyclopaedia.com/browse/RP.HTM
Any of various diving ducks found in Europe and North America, especially the genus Aythya. They feed largely on water plants. Their nest is made in long grass on the borders of lakes and pools Found on https://www.encyclo.co.uk/local/21221