(barn, corn, threshing- )floor, (threshing-, void) place

“Floor” From Boyd’s Bible Dictionary:

(1 Kings 22:10; 2 Chron. 18:9) [AGRICULTURE]

“Threshing” From Boyd’s Bible Dictionary:

(thrashing). Done anciently by treading with oxen or horses, or by drawn sleds, sometimes spiked, on earthen floors, usually on high spots of ground (Deut. 25:4; 1 Chron. 21:15-28; Isa. 28:27-28; 41:15-16). The flail or stick is mentioned (Ruth 2:17).

Concise Bible Dictionary:

This is accomplished in the East by the grain being trodden on by oxen, and that it was so threshed in ancient times is shown by the law that the ox should not be muzzled that trod out the corn (Deut. 25:4). There were also threshing “instruments,” with which the grain was beaten out. Threshing was also accomplished by oxen drawing over the grain a sort of sledge without runners, by which the straw also was crushed (2 Sam. 24:22; Isa. 41:15).

Strong’s Dictionary of Hebrew Words:

Transliteration:
goren
Phonic:
go’-ren
Meaning:
from an unused root meaning to smooth; a threshing- floor (as made even); by analogy, any open area
KJV Usage:
(barn, corn, threshing- )floor, (threshing-, void) place

From Manners and Customs of the Bible:

Genesis 50:10 They came to the threshing-floor of Atad, which is beyond Jordan.
The “threshing-floor” was not a shed, or a building, or any place covered with roof and surrounded by walls, but a circular piece of ground from fifty to a hundred feet in diameter, in the open air, on elevated ground, and made smooth, hardy, and clean. Here the grain was threshed and winnowed.