0 a word used in some parts of the US to mean crayfish (= a small animal living in rivers that is similar to a lobster):
The bullfrogs sit motionless in the water, their toes dangling to sense any movement, such as a crawdad or school of minnows.
Around here we don't say crawdad, it's crawfish!
Remember when you were a kid and it was exciting to find a crawdad under an overturned rock.
New wells are dug for homes, rice plantations and crawdad farms.