The simultaneous purchase and sale of a pair of calls (or puts) in the same metal but at different strike prices or different expiration dates, or both. The option equivalent of a carry. Found on http://www.metalbulletin.com/Glossary.html
An option spread is an options strategy that requires the opening two opposite positions to hedge against risk. With an options spread strategy, investors buy and sell the same number of options on an underlying asset, but at a different strike price and maturity. Found on https://www.myaccountingcourse.com/accounting-dictionary/accounting-diction