The meaning of Ark in the Bible
(From Easton's Bible Dictionary)

Noah's ark, a building of gopher-wood, and covered with pitch, 300 cubits long, 50 cubits broad, and 30 cubits high (Genesis 6:14-16); an oblong floating house of three stories, with a door in the side and a window in the roof. It was 100 years in building (Genesis 5:32; 7:6). It was intended to preserve certain persons and animals from the deluge which God was about to bring over the earth. It contained eight persons (Genesis 7:13; 2Pet. 2:5), and of all "clean" animals seven pairs, and of "unclean" one pair, and of birds seven pairs of each sort (Genesis 7:2,3). It was in the form of an oblong square, with flat bottom and sloping roof. Traditions of the Deluge, by which the race of man was swept from the earth, and of the ark of Noah have been found existing among all nations.

See more on the meaning of Ark in the Bible:
Ark {International Standard Bible Encyclopedia}

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