G3722 ὄρθρος (órthros)

KJV renderings: early in the morning
Strong's definition: dawn (as sun-rise, rising of light); by extension, morn
Derivation: from the same as G3735 (ὄρος);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.