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Kief ([keːf, ki(ː)f]; from Arabic كيف (kayf), meaning ' pleasure, intoxication'), sometimes transliterated as keef or kif, refers to the resinous trichomes of cannabis that may accumulate in containers or be sifted from loose, dry cannabis flower with a mesh screen or sieve. Using a three-chamber herb grinder the cannabis can be finely ground while letting kief crystals fall through a screen and collect into a small compartment. Kief contains a much higher concentration of psychoactive cannabinoids, such as THC, than that of the cannabis flowers from which it is derived. Traditionally, kief has been pressed into cakes of hashish for convenience in storage, but can be vaporized or smoked in either form. After the kief is collected it is heated and pressurized, which turns it into hashish.
In Morocco, kif also refers to a traditional mix of finely-chopped marijuana and indigenous tobacco which is distinctly different from trichome powder and usually smoked in a long pipe called a sebsi.