A method of improving the fertility of poor soils by adding a layer of small stones atop the soil, with perhaps some fertilizer atop the soil before adding rocks. The added rocks/stones would leech...

(organic chemistry) Any sulfonic acid derived from camphor, but especially d-camphorsulfonic acid (known as Reychler's acid) classically used to resolve stereoisomers

(anatomy) ethmoturbinal turbinate

To be careful and alert to the possibility of danger.