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The Collaborative International Dictionary
Felo-de-se

Felo-de-se \Fe"lo-de-se`\, n.; pl. Felos-de-se. [LL. felo, E. felon + de of, concerning + se self.] (Law) One who deliberately puts an end to his own existence, or loses his life while engaged in the commission of an unlawful or malicious act; a suicide.
--Burrill.

Douglas Harper's Etymology Dictionary
felo-de-se

in old law use, "one who commits the felony of suicide," whether deliberately or in maliciously attempting to kill another, Latin, literally "one guilty concerning himself." See felon.

Wiktionary
felo-de-se

n. (context legal English) One who deliberately puts an end to his own existence, or loses his life while engaged in the commission of an unlawful or malicious act; a suicide.

WordNet
felo-de-se
  1. n. a person who kills himself intentionally [syn: suicide]

  2. an act of deliberate self destruction