dictionaryable 

Something that can be defined in the dictionary.

"Are you sure swing-swangle is dictionaryable?"

dictionaryable by Batboot March 31, 2014

Dictionariable 

A word that is able to be defined in a dictionary

"I ain't going over there."
"Is ain't a word?"
"It's dictionariable."

Dictionariable by FOXES! June 19, 2016