Search Result for "regicide": 
Wordnet 3.0

NOUN (2)

1. someone who commits regicide; the killer of a king;

2. the act of killing a king;


The Collaborative International Dictionary of English v.0.48:

Regicide \Reg"i*cide\ (r[e^]j"[i^]*s[imac]d), n. [F. r['e]gicide; L. rex, regis, a king + caedere to kill. Cf. Homicide.] 1. One who kills or who murders a king; specifically (Eng. Hist.), one of the judges who condemned Charles I. to death. [1913 Webster] 2. The killing or the murder of a king. [1913 Webster]
WordNet (r) 3.0 (2006):

regicide n 1: someone who commits regicide; the killer of a king 2: the act of killing a king
Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "regicide": aborticide, fratricide, fungicide, genocide, germicide, herbicide, homicide, infanticide, insecticide, matricide, microbicide, parricide, patricide, pesticide, rodenticide, sororicide, suicide, uxoricide, vermicide
Bouvier's Law Dictionary, Revised 6th Ed (1856):

REGICIDE. The killing of a king, and, by extension, of a queen. Theorie des Lois Criminelles, vol. 1, p. 300.