What does semiochemical mean?
A semiochemical is a chemical substance that carries information between living organisms or affects their behavior. Unlike a scent that merely has an odor, a semiochemical is typically understood in its biological context as a form of chemical communication or a cue. Animals use such substances for many purposes: ants leave trail markers, many insects use sex pheromones, and mammals can recognize individuals or reproductive status through scent. Plants also release semiochemicals. Their volatile compounds may attract pollinators, discourage herbivores, or alert nearby tissues to stress, although whether such effects represent deliberate communication or simply incidental chemical responses can be difficult to establish. The term is therefore broader than “pheromone,” which usually refers specifically to an animal-to-animal chemical signal. Semiochemistry is an important subject in ecology, agriculture, pest control, and the study of animal behavior, showing that chemical signals form a substantial part of the sensory world.
A chemical substance that conveys information between organisms or influences their behavior.
"The predator detected a semiochemical left on the vegetation by its prey."
This term is broader than “pheromone” and may include animal, plant, fungal, and microbial chemical signals or cues.
Relating to or constituting a chemical substance that conveys information between organisms or influences their behavior.
"The researchers identified a semiochemical pathway that enables the moth to locate its host plant."
Used when referring to multiple chemical signals or cues, especially in biological research.
"Several semiochemicals influence the feeding and reproductive behavior of the insects."
Flowers, fungi, insects, and mammals can all communicate through chemicals: nature has a vocabulary written in molecules.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does semiochemical come from?
The word combines the element “semio-,” ultimately from Greek sēmeiōtikos, meaning “pertaining to signs,” with “chemical.” It developed as a specialized term for chemicals functioning as signals or cues in biological communication. The Greek root also underlies English words such as “semiotic” and “semantics,” although “semiochemical” belongs to the scientific vocabulary of modern biology.
Related word forms
How semiochemical is actually used
The term is most common in biology and ecology. It is broader than “pheromone,” since semiochemicals may be produced by animals, plants, fungi, and microorganisms, and may act as either signals or environmental cues.
Easily confused with semiochemical
A pheromone is a semiochemical released by an animal to influence other members of the same species, whereas a semiochemical may also be produced by plants or other organisms and can serve as a cue rather than a communicative signal.