verb

• (of a surface) to get such scratches
  "This platter scratches easily."
• (music) To produce a distinctive sound on a turntable by moving a vinyl record back and forth while manipulating the crossfader (see also scratching).
• (billiards) To commit a foul in pool, as where the cue ball is put into a pocket or jumps off the table.
  "Embarrassingly, he scratched on the break, popping the cue completely off the table."
• (billiards, dated, US) To score, not by skillful play but by some fortunate chance of the game.

noun

• (sports)
  "He started a few seconds before the time and came up in speed to the scratch at the moment appointed."
• (sports)
• (sports)
  "Eventually the elephant and camel were despatched by themselves with two laps start of the bicyclist and horse, the motor car being scratch."
• (sports)

adj

• (computing) Relating to a scratchpad, a data structure or recording medium attached to a machine for testing or temporary use.
  "scratch memory"
• (sports) (of a player) Of a standard high enough to play without a handicap, i.e. to compete without the benefit of a variation in scoring based on ability.
  "... the shot that does most to make a genuine scratch golfer is the mashie shot up to the pin — not merely up to the green."

name

• (programming) A free educational visual programming language developed by the Massachusetts Institute of Technology Media Lab.