Etymology
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wavelet (n.)
1808, mainly in poetry, from wave (n.) + diminutive suffix -let.
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undulation (n.)
1640s, from Medieval Latin *undulatio, from Late Latin undulatus "wavy, undulated," from undula "wavelet," diminutive of Latin unda "a wave," from PIE *unda-, nasalized form of root *wed- (1) "water; wet."
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