depth

• n. [海洋]深さ、深遠さ

deepの名詞形から。

depth

depth: [14] Depth is not as old as it looks. Similar nouns, such as length and strength, existed in Old English, but depth, like breadth, is a much later creation. In Old English the nouns denoting ‘quality of being deep’ were dīepe and dēopnes ‘deepness’.
=> deep

depth (n.)

late 14c., apparently formed in Middle English on model of length, breadth; from Old English deop "deep" (see deep) + -th (2). Replaced older deopnes "deepness." Though the English word is relatively recent, the formation is in Proto-Germanic, *deupitho-, and corresponds to Old Saxon diupitha, Dutch diepte, Old Norse dype, Gothic diupita.

1. Mr Gibson is clearly intellectually out of his depth .

ギブソン氏は明らかに知性が足りない。

2.White wines tend to gain depth of colour with age.

白ワインは年を取るほど色が濃くなる。

3.The smaller lake ranges from five to fourteen feet in depth .

小さい湖の深さは5フィートから14フィートまでさまざまです。

4.Both housings are waterproof to a depth of two metres.

両カバーの防水深さは2メートルである。

5.The fat，broad tyres had a good depth of tread.

という幅広のタイヤは深いトレッドパターンを持っている。