half-hour

[haf-ouuhr, -ou-er, hahf-]
noun
1.
a period of 30 minutes.
2.
the midpoint between the hours: The clock struck on the half-hour.
adjective
3.
of, pertaining to, or consisting of a half-hour: half-hour programs.

Origin:
1375–1425; late Middle English

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
half-hour
 
n
1.  a.  a period of 30 minutes
 b.  (as modifier): a half-hour stint on the treadmill
2.  a.  the point of time 30 minutes after the beginning of an hour
 b.  (as modifier): a half-hour chime
 
half-'hourly
 
adv, —adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
During the first half-hour they should be covered, watched carefully, and
  frequently turned.
Bake one hour in slow oven, covering the first half-hour of baking.
Cover closely, and cook slowly three hours, uncovering for the last half-hour.
Tired and unstrung as he must be by the devoted labors of the last half-hour,
  he is in no condition to effect a rescue.
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