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surface-to-underwater

[sur-fis-too-uhn-der-waw-ter, -wot-er]
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adjective
  1. (of a missile, message, etc.) traveling from the surface of the earth to a target underwater.
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adverb
  1. from the surface of the earth to a target underwater.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018