furrow; space between ridges
Primarily an agricultural term for the furrow or trench between raised planting ridges. The second gloss 'room with ridged roof' is a rare, possibly historical or architectural use; the main modern meaning is the farming sense.
Water is run through the furrows to irrigate the crops.
Walk along the furrows and pull out the weeds.
Compound of 畝 (うね, 'ridge') and 間 (ま, 'space between'). The reading うねま is a straightforward combination.