Kief [keef] (from Arabic, meaning ‘well-being’ or ‘pleasure’) refers to the resin glands (or trichomes) of cannabis which may accumulate in containers or be sifted from loose dry cannabis buds with a mesh kiefing screen or sieve.
Kief contains a much higher concentration of desired psychoactive cannabinoids, such as THC, than other preparations of cannabis buds from which it is derived. Traditionally kief has been pressed and baked into cakes as hashish for convenience in storage and shipping, but can be vaporized or smoked in its powder form.
The Daily Omnivore 
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