3 having only a small number of people or a small amount of something: --
4 Air that is thin contains less oxygen than the air at sea level: --
In the northern highlands of Ethiopia the air is thin and I'm breathless after the climb.
For many riders, the first day in the mountains is the hardest, as they struggle to adjust to the thinner air.
Altitude sickness is suffered by mountain climbers breathing thin air with little oxygen on high peaks.
5 (of a liquid) flowing easily: --
a thin soup
Farmers delayed thinning primarily to obtain more fodder.
If farmers have to maintain a desired population at harvest, soil moisture, fertility and pest management must be improved and thinning should be completed earlier.
Eight seeds were planted, and subsequently thinned to three following germination.
The wall of the left ventricle was again hypoplastic and thinned.
Only barren, diseased and lodged plants were thinned at later stages of crop growth.
Trees that have not been thinned and have set a large crop will therefore tend to abscise far more fruits than trees that were thinned.
Seedlings were thinned to three per pot (capacity 900 ml) and held in place with foam bungs.
Seedlings were thinned to one plant per hole.
