Gallery

Heb. 'attik (Ezekiel 41:15,16), a terrace; a projection; ledge.

Heb. rahit (Cant 1:17), translated "rafters," marg. "galleries;" probably panel-work or fretted ceiling.

Source: Easton's Bible Dictionary
Gallery

GAL'LERY,n.

1. In architecture, a covered part of a building, commonly in the wings, used as an ambulatory or place for walking.
2. An ornamental walk or apartment in gardens, formed by trees.
3. In churches, a floor elevated on columns and furnished with pews or seats; usually ranged on three sides of the edifice. A similar structure in a play-house.
4. In fortification, a covered walk across the ditch of a town, made of beams covered with planks and loaded with earth.
5. In a mine, a narrow passage or branch of the mine carried under ground to a work designed to be blown up.
6. In a ship, a frame like a balcony projecting from the stern or quarter of a ship of war or of a large merchantman. That part at the stern, is called the stern-gallery; that at the quarters,the quarter-gallery.
Source: King James Dictionary
Gallery

an architectural term describing the porticos or verandas which are not uncommon in eastern houses. It is doubtful, however, whether the Hebrew words so translated have any reference to such an object. (According to the latest researches, the colonnade or else wainscoting is meant. (Solomon 1:17; Ezekiel 41:15) --Schaff.)

Source: Smith's Bible Dictionary