機雷 is read as きらい (kirai) and means (sea) mine.
きらい
kirai
きらいげん
minefield
きらいかんてい
mine warfare vessel
じききらい
magnetic mine
きどうたい
riot police
きびん
smart
きげん
safety
きき
device
きみつ
secrecy
きかんじゅう
machine gun
きかんし
engineer (on a train, ship, aircraft, etc.)
きび
subtle
きみつひ
secret funds