from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A bomb that is designed to attack underground fortified positions by penetrating rock or concrete to a certain depth before exploding.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a 5,000 pound laser-guided bomb that can be programmed to penetrate to a given depth before exploding; used to penetrate hardened underground facilities
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