What are Trichomes?
The term “Trichome” itself defines an outgrowth or appendages on plants, algae, lichens or protists.
On marijuana they look like tiny crystals, white powder or little hairs that cover the buds and leaves near them. Once you look closer, you’ll notice that it’s actually thousands of small little bulbs
These little guys also carry a beautiful odor and a large amounts of cannabinoïd’s produced by the plant, among them the famous TetraHydroCannabinol (THC) and Cannabidiol (CBD).

Trichome - Botanical Definition
The Wikipedia definition of Trichomes is the following:
Trichomes (/ˈtraɪkoʊmz/ or /ˈtrɪkoʊmz/), from the Greek τρίχωμα (trichōma) meaning “hair”, are fine outgrowths or appendages on plants, algae, lichens, and certain protists. They are of diverse structure and function. Examples are hairs, glandular hairs, scales, and papillae. A covering of any kind of hair on a plant is an indumentum, and the surface bearing them is said to be pubescent.