Result from Foreign Dictionaries (2 entries found)
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Conning tower \Con"ning tow"er\,
1. n. The shot-proof pilot house of a war vessel. [archaic]
[1913 Webster]
2. the raised structure rising above the deck of a submarine.
[PJC]
From WordNet (r) 3.0 (2006) [wn]:
conning tower
n 1: an armored pilothouse on a warship
2: a raised bridge on a submarine; often used for entering and
exiting