Crossword puzzle clue "surface undulation"

Here are the possible solutions for surface undulation clue

Answer
Clue
Relevancy
wave
Clue
Surface undulation
Undulation
Undulation in the stands
hula
Clue
Hilo undulation
Definition
(Hawaiian) a sinuous Polynesian dance with rhythmic hip movements
hulahoop
Clue
Fifties fad involving undulation
ripple
Clue
Undulation
lance
Clue
Army surface-to-surface missile
Definition
to pierce with a spearlike weapon
routine
Clue
Dive, surface, dive, surface, etc.?

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