William Henry Harrison wil·liam·hen·ryharrison uncommon noun 1. 9th President of the United States; caught pneumonia during his inauguration and died shortly after (1773-1841) SynonymsHarrisonWilliam Henry HarrisonPresident HarrisonPresident William Henry Harrison Related words Broader terms President of the United States WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.