This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Designed to intercept and destroy another missile in flight: antimissile defense; an antimissile missile.

adj. Designed to intercept and destroy another missile in flight.

n. A missile or system designed to intercept and destroy another missile in flight.

"Mrs. Clinton and Mr. Gates met in Brussels to show support for NATO's proposed antimissile system."

bristle    dismissal    epistle    fissel    fissile    gristle    missal    missel    missile    thistle   

anti-armor    anti-missile    antiship    quantumcascade    antiair    well-entrenched    submarine-launched    air-to-surface    heat-seeking    ground/vehicle