"Tetrode" validity in different word game dictionaries

Dictionary Validity
Scrabble US(US/Canada/Thailand - TWL/NWL) Yes
Scrabble UK(International - SOWPODS/CSW) Yes
Words with Friends(WWF) Yes

"tetrode" Definition

  1. a vacuum tube with a cathode, an anode, a control grid, and an additional grid or other electrode

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