Underside

//ˈʌndɚsaɪd// noun

noun ·Uncommon ·Advanced level

Definitions

Noun
  1. 1
    The side that is below or underneath, the bottom.

    "A correspondent suggested that the superior riding qualities of the latter were due to the absence of piston-valve chests above the cylinders, which made it possible to bring the underside of the water-tanks to a lower level than that of the "Rivers", so minimising the unsteadying effect of water surging in the tanks."

  2. 2
    the lower side of anything wordnet

Synonyms

All synonyms
bottombedbedrockbellybottombottom side

Example

More examples

"A spider can produce a silky substance from tiny openings on its underside."

Etymology

From under- + side.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.