chemo-, chem-, chemico-, chemi-, -chemist, -chemic, -chemical +

(Arabic > Greek > Latin: the art of combining base metals [to make gold]; from Greek, chemia, “Egypt”, supposedly where the art of changing metals into gold existed)

agrichemistry (s) (noun) (no pl)
The science dealing with the use of chemicals in agriculture: When Jack took courses in agriculture, he also had a class in agrichemistry that dealt with the use of synthetic substances employed in growing crops.
agrochemical (s) (noun), agrochemicals (pl)
A chemical used to improve the quality of farm products: Hormones, fungicides, or insecticides are agrochemicals that upgrade the production of crops.

An agrochemical is used in agriculture, especially as a biologically active one, such as a weedkiller or a fungicide.

Someone who studies or practices alchemy.
The chemistry of the Middle Ages and 16th century; now applied distinctively to the pursuit of the transmutation of baser metals into gold, which (with the search for the alkahest, or universal solvent; and the panacea, or universal remedy) constituted the chief practical object of early chemistry. Via Old French alquemie and medieval Latin alchimia from Arabic al-kimya, “the chemistry”, ultimately from Greek khemeia.
Science is facts; just as houses are made of stones, so is science made of facts; but a pile of stones is not a house and a collection of facts is not necessarily science.
—Henri Poincaré
allelochemics, allelochemic
1. Chemical interactions between species, involving release of active chemical substances; such as, scents, pheromones, and toxins.
2. A secondary substance produced by an organism that has the effect of modifying the growth, behavior or population dynamics of other species, often having an inhibitory or regulatory effect.
allochemic (adjective), more allochemic, most allochemic
1. Any secondary compound produced by plants as part of their defense mechanism against herbivores; acting either as a toxin or digestibility reducer.
2. A reference to interaction (other than purely nutritional ones) involving chemicals by which organisms of one species affect the growth, health, behavior, or population of those of another species.
1. The study of the chemical elements found in outer space, generally on larger scales than the Solar System, particularly in molecular gas clouds, and the study of their formation, interaction and destruction.
2. The branch of science that explores the chemical interactions between dust and gas interspersed between the stars.
A specialist in biochemistry.
1. The chemistry of living organisms and of the chemical, molecular, and physical changes occurring therein; such as, biological chemistry and physiological chemistry.
2. The science dealing with the substances present in living organisms and with their relation to each other and to the life of the organism; biological or physiological chemistry.
3. The branch of biochemistry that deals with the relation of chemicals found in the soil to living organisms; the biological application of geochemistry.

Biochemistry includes the chemical reactions of living cells. It is based on the idea that all of life can be understood as chemistry. Situated between biology and chemistry, the field of biochemistry relates to all branches of chemistry and biology, ranging from genetics to physical chemistry, from medicine to agriculture, from nutrition to biotechnology.

The universe is full of magical things patiently waiting for our wits to grow sharper.

—Eden Phillpots
Denoting the relationship between biologic action and chemical structure, as in food and drugs.
1. The study of the relationship between biologic action and chemical structure.
2. Macroscopic, or gross morphology, as revealed by biochemical techniques.
bioelectrochemistry (s) (noun), bioelectrochemistries (pl)
The use of techniques, tools, and knowledge gained in the study of the electrochemistry and physiology of living organisms.
A reference to the science dealing with the relationship between the geochemistry of a given region and its flora and fauna, including the circulation of such elements as carbon and nitrogen between the environment and the cells of living organisms.
biogeochemical cycle (s) (noun), biogeochemical cycles (pl)
The circulation of chemical components through the biosphere from, or to, the lithosphere, atmosphere, and hydrosphere: The biogeochemical cycle includes the exchange of elements, like oxygen, carbon, or nitrogen, in the environment between storage pools, such as the atmosphere, biota, oceans, soils, the earth's crust, and human society.
biogeochemistry (s) (noun) (no pl)
The branch of science that studies the biological, chemical, and geological aspects of environmental processes: Biogeochemistry deals with the relation of chemicals found in the soil to living organisms. It is the biological application of geochemistry.

Biogeochemistry is the study of the influence of living organisms and life processes on the chemical structure and history of the Earth.

Biogeochemistry also includes the study of the interactions between the biosphere and its mineral environment, for example, the study of the effect of living organisms on the weathering of rocks and of the concentration of elements by living systems.

Pointing to a page about a chemical elements A Chemical-Elements Chart History, Part 1, is available here.

Pointing to a page about chemical elements See this list of chemical elements, for a greater understanding.