What does biochemical mean?
"Biochemical" is an adjective describing anything connected with the chemistry of life — the chemical substances and reactions that occur inside living organisms. A biochemical reaction might be the breakdown of sugar for energy; a biochemical marker might be a molecule in blood that signals disease. The word sits at the intersection of biology and chemistry, and it carries an unmistakably technical, clinical tone: it appears constantly in medical reports, laboratory research, and science journalism, but rarely in casual conversation. Its second sense extends slightly beyond the body itself, describing things produced through or analyzed by the science of biochemistry, as in "biochemical warfare agents." Because it derives from two classical roots — Greek "bios" (life) and, via Arabic and medieval Latin, the vocabulary of "chemistry" — it neatly encodes the modern idea that life can be understood at the molecular level. For anyone reading about health or science, recognizing "biochemical" signals that the discussion has moved from whole organisms down to the molecules that run them.
adjectiveRelating to the chemistry of living organisms, or to the chemical processes and substances that occur within them. It can also describe something resulting from or analyzed by the study of such chemistry.
- Relating to the chemical processes and substances occurring within living organisms.
- Produced by, or studied using, the science of biochemistry (e.g. a biochemical assay, a biochemical weapon).
"Researchers traced the disease to a single biochemical defect in the way cells process fat."
"Doctors measured several biochemical markers to assess her liver function."
"The ripening of fruit is driven by a cascade of biochemical changes."
Every thought you're having right now is a storm of biochemical reactions — roughly 37 trillion trillion of them per second in your body.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of biochemical
The word combines the Greek root "bios" (life) with "chemical," whose lineage runs from Arabic "al-kīmiyāʾ" through medieval Latin "alchemia" and into the English "chemistry." As a compound, "biochemical" emerged in the late nineteenth and early twentieth centuries, when scientists first began systematically explaining life's processes in molecular terms and the discipline of biochemistry took shape. It shares its Greek root with words like "biology," "biography," and "biosphere."
Related word forms
How biochemical is actually used
A formal, scientific register word, most common in medicine, research writing, and science journalism. In everyday speech people more often say "chemical" or "biological," so "biochemical" signals technical precision. It functions almost exclusively attributively or predicatively before nouns; it has no comparative forms.
Easily confused with biochemical
"Biological" broadly concerns all aspects of living things, while "biochemical" specifically concerns their chemical substances and processes.
"Biochemistry" is the noun naming the scientific discipline, whereas "biochemical" is its adjective form describing related things.