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The correct selling is eicosanoid instead of ecosinoid. In biochemistry, an eicosanoid is a signaling molecule. They are classes of compounds made of fatty acids.

eicosanoid

Leukotrienes are a family of eicosanoid inflammatory mediators produced in leukocytes by the oxidation of arachidonic acid by the enzyme arachidonate 5-lipoxygenase.

As their name implies, leukotrienes were first discovered in leukocytes, but have since been found in other immune cells.

Eicosanoids come in two broad groups: the leukotrienes and the prostanoids, both of which are involved in signaling between cells. They are encountered frequently in the study of inflammation, and are commonly considered inflammatory mediators (ways for the cells of the immune system to signal where, when, and how inflammation should take place).

An example of a prostanoid is prostaglandin E2 (PGE2), which plays a role in the sensitization of pain receptors during inflammation.