Translation

The Japanese word for "Dinosaur" is kyouryū 恐竜.

Romaji kyou ryuu
Hiraganaきょうりゅう
Katakanaキョウリュウ
Kanji 恐 竜
Meaning Fear Dragon
School Level 中 中

Loan-word

The word "Dinosaur" katakanized would be dainosō ダイノソー.
Romaji da i no soo
Katakanaダイノソー
Hiraganaだいのそー

Further Reading

Wikipedia: Dinosaur (恐竜)