Definition of undersurface in English:

undersurface

noun

  • The lower or under surface of something.

    • ‘By pulling up, the pilot may be able to protect more vulnerable parts of the aircraft such as the canopy or engines by taking a strike on the undersurface of the aircraft.’
    underside, lower side, underneath, undercarriage, underpart, belly, underbelly
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Pronunciation

undersurface

/ˈʌndəsəːfɪs/