octocentenary

[ok-toh-sen-ten-uh-ree, -sen-tn-er-ee or, especially Brit., -sen-tee-nuh-ree]

oc·to·cen·ten·ar·y

[ok-toh-sen-ten-uh-ree, -sen-tn-er-ee or, especially Brit., -sen-tee-nuh-ree] adjective, noun, plural oc·to·cen·ten·ar·ies.
adjective
1.
pertaining to 800 or a period of 800 years; marking the completion of 800 years.
noun
2.
an 800th anniversary or its celebration.

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Octocentenary has a plethora of syllables.
So is dichlorodiphenyltrichloroethane. Does it mean:
a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S.
a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells.

Origin:
1885–90; octo- + centenary
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source Link To octocentenary
Collins
World English Dictionary
octocentenary (ˌɒktəʊsɛnˈtiːnərɪ)
 
n , pl -naries
an eight-hundredth anniversary

Collins English Dictionary - Complete & Unabridged 10th Edition
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