LSD (lysergic acid diethylamide).

(physics) A minor stable isotope of magnesium, ²⁵₁₂Mg, having twelve protons and thirteen neutrons; it amounts to about 10% of the element in nature

plural of 25-NB

Any of a group of N-benzylphenethylamine derivatives, that have methoxy groups at positions 2- and 5-, that have psychedelic activity

Abbreviation of twenty-five/eight.