Strong's Concordance

Original word: ἡμιώριον
Transliteration: hémiórion
Definition (short): half
Definition (full): half an hour

NAS Exhaustive Concordance

Word Origin: from the root of hémisus and hóra
Definition: half an hour
NASB Translation: half an hour (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From the base of hemisu and hora; a half-hour -- half an hour.

see GREEK hemisu

see GREEK hora

KJV: And when he had opened the seventh seal, there was silence in heaven about the space of half an hour.
NASB: When the Lamb broke the seventh seal, there was silence in heaven for about half an hour.