from The American Heritage® Dictionary of the English Language, 4th Edition
- suffix In a specified manner, direction, or position: clockwise.
- suffix With reference to; in regard to: profitwise.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- suffix in the direction or orientation of
- suffix in the manner of
- suffix in the matter of; with regard to
The term penny-wise is hyphenated because it is a compound modifier in which wise means smart, rather than a use of the suffix -wise.
Claims to pay less than his secretary because she pays INCOME taxes while he pays CAPITAL GAINS- very different taxation %-wise, 2.