Definition of undersurface in US English:

undersurface

noun

  • The lower surface of something; the surface underneath, or on the bottom 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
    View synonyms

Pronunciation

undersurface

/ˈəndərˌsərfəs/