Naturally occurring in opium:
A high number of opiates are considered to be highly addictive. One exception is loperamide[?], which cannot cross the blood-brain barrier.
See also nootropics
Opiate is an EP by Tool, an American rock band formed in 1989. See Opiate (album)
Opiate is also the name of a rock-metal band based in the United Kingdom and signed to Visible Noise[?] records, home of lost prophets[?]. See Opiate (band)[?].
... b ≤ a then a = b (antisymmetry)
A set with a partial order on it is called a partially ordered set, poset, or, often, simply an ordered set.
Examples of posets ...
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