American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
Called the frustum, the section resembles a giant funnel.— collectSPACE Today In Space History
The frustum is located between the forward skirt extension and the upper stage of the Ares I-X.— collectSPACE Today In Space History
The frustum is manufactured by Major Tool and Machine Inc. in Indiana under a subcontract with Alliant Techsystems Inc., or ATK, the Ares first stage prime contractor.— collectSPACE Today In Space History
The frustum will be integrated with the forward skirt and forward skirt extension, which already are in the Assembly and Refurbishment Facility.— collectSPACE Today In Space History
During the flight, the booster will separate at the frustum, a cone-shaped piece that attaches the first stage to the larger diameter upper stage.

American Heritage Dictionary (1)
Century Dictionary (1)
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