Moldboard \Mold"board`\, Mouldboard \Mould"board`\, n.

1. A curved plate of iron (originally of wood) back of the share of a plow, which turns over the earth in plowing. [1913 Webster]

2. (Founding) A follow board. [1913 Webster] Molder

Source: The Collaborative International Dictionary of English v.0.48
 

mouldboard

Source: WordNet (r) 2.0
 

Moldboard \Mold"board`\, Mouldboard \Mould"board`\, n.

1. A curved plate of iron (originally of wood) back of the share of a plow, which turns over the earth in plowing.

2. (Founding) A follow board.

Source: Webster's Revised Unabridged Dictionary (1913)