noun

• (aviation, military) A military aircraft designed to carry and drop bombs.
  "As many as 100,000 Japanese people were killed and another million injured, most of them civilians, when more than 300 American B-29 bombers dropped 1,500 tons of firebombs on the Japanese capital that night."
• (clothing) Ellipsis of bomber jacket.
  "A few years ago, the leather bomber was a gold mine for retailers and a gravy train for vendors. Consumers were crazy for them."
• (US, slang) A 22-ounce beer bottle.
• (slang) A large cannabis cigarette.
  "In Canada, marihuana cigarettes rarely contain any tobacco, and may vary in size from a few hundred milligrams up to a several gram "bomber.""

adj

• (climbing, slang) Completely solid and secure, usually referring to some form of protective gear.