the GNU version of the Collaborative International Dictionary of English
adj. Capable of being plowed; arable.
The Century Dictionary and Cyclopedia
Capable of being plowed; arable.
Word Usage
"Every storm falls into one of 3 categories: either "nuisance", where there are minor problems, but people get around town just fine, or the storm is "plowable" - as the word implies, enough to shovel and plow."