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Answer for the clue "U.S.S.R.'s Big Ivan, e.g.", 5 letters:
hbomb

Alternative clues for the word hbomb

SALT concern

Frightful force

The first one went off in 1952

It was tested on Bikini, 1954

Thermonuclear blast maker

Weapon since 1952

Blast maker, informally

*Weapon first tested in '52

16-Across concern, briefly

Certain W.M.D.

Test ban subject, briefly

Big bang maker, informally

Eniwetok blaster, informally

Exploder at Eniwetok: 1952

Powerful weapon