Easton's Bible Dictionary (1897)
A little wing, (Matt. 4:5; Luke 4:9). On the southern side of the temple court was a range of porches or cloisters forming three arcades. At the south-eastern corner the roof of this cloister was some 300 feet above the Kidron valley. The pinnacle, some parapet or wing-like projection, was above this roof, and hence at a great height, probably 350 feet or more above the valley.
Smith's Bible Dictionary (1863)
(of the temple), (Matthew 4:5; Luke 4:9) The Greek word ought to be rendered not a pinnacle, but the pinnacle. The only part of the temple which answered to the modern sense of pinnacle was the golden spikes erected on the roof to prevent birds from settling there. Perhaps the word means the battlement ordered by law to be added to every roof.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
PIN'NACLE. The word translated "pinnacle," Matt 4:5; Luke 4:9, signifies, not a summit, but a wing; and the part of the temple to which our Lord was taken by Satan was probably the elevation over the roof of Solomon's porch, to which there was a passage by stairs, and which overlooked the valley on the east, and had beneath a perpendicular depth of 600 or 700 feet, for at this part of the valley a wall had been The Eastern Pine. carried up to a level with the ground on which the temple stood (some historians say 750 feet).