Here's what I've got this week from Perelandra by C. S. Lewis:
Reentrants: reentering angles
It was an irregularly shaped object with many curves and reentrants. (p. 37) [Angles and curves together...now that is irregularly shaped.]
1. A strong yellow color.
2. A gum resin obtained from the sap of trees of the genus Garcinia, used as a yellow pigment and as a cathartic.
It was variegated in colours like a patch-work quilt--flame-colour, ultramarine, crimson, orange, gamboge, and violet. (p. 37)
Friable: easily crumbled or pulverized
Burrowing idly with his fingers he found something friable like dry soil, but very little of it, for almost at once he came upon a base of tough, interlocked fibres. (p. 40)