The specific futures contract that is bought or sold by exercising an option. Chicago Board of Trade glossary
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The futures contract covered by an option; for example, a 300 Dec. corn call's underlying futures contract is the December corn futures contract. The CENTER ONLINE Futures Glossary
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A futures contract that supports an option on that future, which is executed if the option is exercised . Bloomberg Financial Dictionary
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Financial and business terms. 2012.