ply

1. A layer of material. (countable, uncountable) · two-ply toilet paper
2. A strand that, twisted together with other strands, makes up rope or yarn. (countable, uncountable)
3. In two-player sequential games, a "half-turn" or a move made by one of the players. (countable, uncountable) · He proposed to build Deep Purple, a super-computer capable of 24-ply look-ahead for chess.

Plural ply