From WordNet (r) 3.0 (2006) [wn]:
Somerset
n 1: a county in southwestern England on the Bristol Channel
2: an acrobatic feat in which the feet roll over the head
(either forward or backward) and return [syn: somersault,
somerset, summersault, summerset, somersaulting,
flip]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Somersault \Som"er*sault\, Somerset \Som"er*set\, n. [F.
soubresaut a jump, leap, OF. soubresault, It. soprassalto an
overleap, fr. L. supra over + saltus a leap, fr. salire to
leap; or the French may be from Sp. sobresalto a sudden
asault, a surprise. See Supra, and Salient.]
A leap in which a person turns his heels over his head and
lights upon his feet; a turning end over end. [Written also
summersault, sommerset, summerset, etc.] "The vaulter's
sombersalts." --Donne.
[1913 Webster]
Now I'll only
Make him break his neck in doing a sommerset. --Beau. &
Fl.
[1913 Webster]