1. the name for a set of hormones that affect receptors in the brain, often reducing the sensation of pain or stress

2. a predecessor to the dolphin, last seen in the mid to late cretaceous, jurassic, and meso-esoteric periods.
1." whoa my endorphins are kicking in, making me happy"
2. "is that a dolphin? no, it's an endorphin."
by angelo michaels July 23, 2006
Your body's natural pain reliever, released when stress or pain levels are high, or after an orgasm.
Equivalent to a narcotic pain reliever once released.
I went for a run and got the Runner's High (endorphins), it felt great.
by callofduty1024 January 30, 2009

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