antiperspirant

n. product that reduces perspiration

Deodorants are substances applied to the body, most frequently the armpits, to reduce the body odor caused by the bacterial breakdown of perspiration. A subgroup of deodorants are "antiperspirants", which prevent odor and reduce sweat produced by parts of the body. Antiperspirants are typically applied to the underarms, while deodorants can also be used on feet and other areas in the form of body sprays.
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Antiperspirant /an·ti·per·spir·ant/ inhibiting or preventing perspiration, or an agent that does this. an·ti·per·spi·rant n. [more]Antiperspirant - Community and Resources

Noun
1. an astringent substance applied to the skin to reduce perspiration
(hypernym) toiletry, toilet article, toiletries

noun & adjective
(substance) which prevents sweating