thirtieth

 [thur-tee-ith]  

thir·ti·eth

   [thur-tee-ith]
adjective
1.
next after the twenty-ninth; being the ordinal number for 30.
2.
being one of 30 equal parts.
noun
3.
a thirtieth part, especially of one (1/30).
4.
the thirtieth member of a series.

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Thirtieth is always a great word to know.
So is zedonk. Does it mean:
a fool or simpleton; ninny.
the offspring of a zebra and a donkey.
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
Origin:
before 900; thirty + -eth2; replacing Middle English thrittythe, Old English thrītegtha
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collins
World English Dictionary
thirtieth (ˈθɜːtɪɪθ)
 
—adj
1.  (usually prenominal)
 a.  being the ordinal number of thirty in counting order, position, time, etc: often written 30th
 b.  (as noun): the thirtieth of the month
 
—n
2.  a.  one of 30 approximately equal parts of something
 b.  (as modifier): a thirtieth part
3.  the fraction equal to one divided by 30 (1/30)

Collins English Dictionary - Complete & Unabridged 10th Edition
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