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1. The 19th letter of the Roman alphabet
   - S, s, ess

1. A radioactive transuranic element produced by bombarding plutonium with neutrons
   - einsteinium, E, atomic number 99

1. The 5th letter of the Roman alphabet
   - E
    
2. The base of the natural system of logarithms; approximately equal to 2.718282...

Derived forms: eses

Type of: alphabetic character, letter, letter of the alphabet, metal, metallic element, transcendental number

Part of: Latin alphabet, Roman alphabet

Encyclopedia: Es