Magen David

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A six-pointed star, a symbol of Judaism, that is formed by placing two triangles together, one inverted over the other or interlaced. Also called Shield of David, Star of David.

Century Dictionary and Cyclopedia

1. n. A cabalistic emblem consisting of two intertwined triangles, forming a six-pointed star. This emblem has been adopted by modern Jews, although it is of non-Jewish origin. The supposed miracle-working cabalists inscribe it upon parchment along with certain formula: and use it as a protecting amulet. The Zionists have placed the magen-David on their flag. See Zionist flag.

Wiktionary

1. n. Star of David

GNU Webster's 1913

1. n. A hexagram{1a}, when used as the symbol of Judaism; called also Mogen David and Star of David. It is included on the flag of Israel.

WordNet 3.0

1. n. a six-pointed star formed from two equilateral triangles; an emblem symbolizing Judaism