Noah's ark

from The Century Dictionary.

• The ark in which, according to the account in Genesis, Noah and his family, with many animals, were saved in the deluge.
• A child's toy representing this ark with its occupants.
• Parallel streaks of cirrus cloud, appearing by the effect of perspective to converge toward the horizon: in some countries a sign of rain. Also called polar bands.
• A bivalve mollusk, Arca noæ, an ark-shell: so named by Linnæus.
• In botany, the larger yellow lady's-slipper, Cypripedium pubescens.

from the GNU version of the Collaborative International Dictionary of English.

• proper noun The ship built by Noah according to God's command, as related in the bible.
• proper noun (Zoöl.) A marine bivalve shell (Arca Noæ), which somewhat resembles an ark, or ship, in form.
• proper noun A child's toy, consisting of an ark-shaped box containing many different wooden animals.
• proper noun Anything having a wide and representative assortment of people or objects of a particular class.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• proper noun The vessel built by Noah under God's instructions, as described in Genesis.
• noun zoology A small bivalve mollusc, Arca noae
• noun uncommon, Australian rhyming slang shark.