Glossary of "Plant Biology (1st ed.)" by Graham et al. (2003)
- Any chemical substance that contains two or more elements, joined by covalent bounds, in definite proportions.
- Graham, L. E., Graham, J. M. & Wilcox, L. W. 2003. Plant Biology. -xxxv + 497 pp. Pearson Education, Inc., Upper Saddle River.