Extra-duty

adj

adj ·Rare ·Advanced level

Definitions

Adjective
  1. 1
    Describing a tennis ball having a thicker felt woven more loosely around the ball's core, designed for hard court surfaces such as asphalt or concrete. not-comparable

    "Coordinate term: regular-duty"

Example

More examples

"The men at the U.S. Open use what is known as an “extra-duty” ball, which means the felt on the outside of the ball is woven slightly more loosely than the “regular-duty” ball the women use. […] Extra-duty balls are the balls of choice for outdoor hardcourts, like those at the U.S. Open, except when they are not."

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