Capricorn
Concise Oxford English Dictionary © 2008 Oxford University Press:
Capricorn /ˈkaprɪkɔːn/
▶noun Astrology the tenth sign of the zodiac (the Goat), which the sun enters at the northern winter solstice (about 21 December).
– derivatives
Capricornian noun & adjective.
Capricornian noun & adjective.
– origin OE, from L. capricornus, from caper, capr- ‘goat’ + cornu ‘horn’.
'Capricorn' also found in these Oxford entries:

