Never rely on online dictionaries!
I have three (3!) Unabridged Websters from different time periods including a 1933 edition which dwarves today's "unabridged" dictionary by about a third or several hundred pages.
Here's the 1983 Unabridged Webster's New Twentieth Century Dictionary's definition:
refutal n. refutation ; a refuting.
SDAI-Tech1
PS
You're right meretricious is not the word you're looking for - what you're looking for is three words: "The veriest verbalist." I am not, as you might suggest, a verbarian.
;-)
