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

LSD (lysergic acid diethylamide).

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

plural of 25-NB

Abbreviation of twenty-five/eight.

Abbreviation of twenty-fifth.

The psychedelic hallucinogen 2-(4-iodo-2,5-dimethoxyphenyl)-N-[(2-methoxyphenyl)methyl]ethanamine developed to map brain usage of the type 2A serotonin receptor, and also used recreationally.

(music, US) Alternative form of two hundred fifty-sixth note.

plural of 256th note