"Countermark" validity in different word game dictionaries

Dictionary Validity
Scrabble US(US/Canada/Thailand - TWL/NWL) No
Scrabble UK(International - SOWPODS/CSW) Yes
Words with Friends(WWF) Yes

"countermark" Definition

  1. an added mark designed to secure greater safety or more complete identification:
  2. a mark put on a package of goods belonging to several persons to show that it may not be opened except in the presence of all
  3. a hallmark added to that of the artificer of gold or silver work
  4. an artificial cavity formerly made in the teeth of horses to disguise their age— compare BISHOP entry
  5. a mark on a coin that is not part of the original design but that has been added as indication of a change in the coin's value, in its issuing authority, or in its country of circulation
  6. a mark on a coin added as attestation of purity or standard value : CHOP MARK
  7. to apply a countermark to

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