There is a little bit of Latin to be learned from the names of the Zodiac signs. More importantly, one should not always rely upon these names as a source of meaning for the corresponding words. This goes especially for Sagittarius, Capricord and Aquarius. The traditional translations of these names is more relevant to the depictions of these constellations, rather than to the Latin words and their meanings.
1. Aries (The Ram) - a ram, a battering ram
2. Taurus (The Bull) - a bull, ox
3. Gemini (The Twins) - plural of 'geminus' 'born at the same time', twin, double, similar
4. Cancer (The Crab) -a crab, the South (because this sign of the Zodiac is found at the time of the summer solstice), cancer
5. Leo (The Lion) - a lion
6. Virgo (The Virgin) - a maid, a virgin, a young woman or girl, something pure
7. Libra (The Scale) - a pair of scales, a measure, the Roman pound, balance
8. Scorpio (The Scorpion) - a scorpion
9. Sagittarius (The Centaur) - an archer, a bowman
10. Capricorn (The Sea-goat) - caper-cornu; cf. in Gr. aigokereus, having goat's horns
11. Aquarius (The Pitcher) - relating to water, a water carrier
12. Pisces (The Fish) - plural of 'piscis' 'fish'