/pot"ash'/ , n.
1. potassium carbonate, esp. the crude impure form obtained from wood ashes.
2. potassium hydroxide.
3. the oxide of potassium, K 2 O.
4. potassium, as carbonate of potash.
[ 1615-25; back formation from pl. pot-ashes, trans. of early D potasschen. See POT 1 , ASH 1 ]