Dictionary of Ichthyology
anchor = a metal device lowered on a line or chain and used to secure a vessel to the sea bed. Also used to secure nets. Anchors have flukes (points that dig into the bottom or grab rocks; the flattened part is called a palm) connecting by arms to a crown, a shank (a vertical bar) rising from the crown, many also have a stock (a horizontal bar that prevents rolling over) which passes through an eye, and a ring (where the rope or chain is attached). There are many different type and sizes of anchors, e.g. see killick, Admiralty pattern anchor, ice anchor and trawl anchor.