Strong's G3722 — ὄρθρος (noun)
orthros (or'-thros) n.
1. dawn (as sun-rise, rising of light)
2. (by extension) early morning
[probably from an obsolete oro "to rise or rear up" (perhaps akin to G142)]
KJV: early in the morning 
See also: G3735, G142 
Occurrences: 3