a. Having thin walls.
1854. Owen, Skel. & Teeth (1855), 7. The thinnest-walled and widest air-bone of the bird of flight was first solid.
1875. Bennett & Dyer, Sachs’ Bot., 90. Alternate layers of narrow thick-walled and broad thin-walled cork-cells are formed.
1875. Huxley & Martin, Elem. Biol. (1877), 184. Posteriorly, the oviducts dilate into capacious thin-walled chambers.
