Pheromone
A pheromone was a chemical secreted by a lifeform that had an effect on another lifeform.

Locator bombs worked by homing in on an individual's pheromones. ()

Some Orion females secreted a highly potent pheromone that accelerated the metabolisms of males of many species, raising adrenaline production to dangerous levels. It caused aggression and a form of delusion that made the males susceptible to suggestion. The pheromone caused headaches in Human females and disrupted the sleep cycle of Denobulan males; Vulcans, however, were immune. The pheromone's effects were cumulative; the longer one was exposed, the more pronounced the results. In 2154, Doctor Phlox of the  theorized that the pheromone acted as a defense mechanism against competition. () Not all Orion females chose to secrete these pheromones. ()

Denobulan females emitted powerful pheromones during their mating season. Male Denobulans often became combative during this time, and mating could require medical supervision. ()

During the finiis'ral, the final stage of a Kriosian empathic metamorph's bonding, they produce elevated levels of what Humans would call pheromones. ()

In 2370, Captain Picard used pheromones from Deanna Troi to lure Worf away from sickbay while they all suffered from Barclay's Protomorphosis Syndrome. ()

Ramurans produced pheromones that prevented the formation of long-term memory engrams in other species they interacted with. ()

In 2375, One, an advanced Borg drone with 29th-century technology, detected an elevated pheromonal response in a  crewmember, indicating that she was afraid of him. ()

In The Adventures of Captain Proton holoprogram, the character of Queen Arachnia had, in her possession, a small vial of her pheromones, which she could use to seduce and control others. Kathryn Janeway, as Arachnia in 2375, used these pheromones against the character of Lonzak. ()

See also
Endocrine system
Pheromonic sensor

External link
 

de:Pheromon
Biochemical compounds
The Adventures of Captain Proton
Glands