Both arc and "arch" come from the Latin element arcus, "bow". Archery and archer also come from this same Latin element.
2. The boat mentioned in the Bible which God commanded Noah to build for shelter during the Great Flood: Noah was commanded to build an ark, big enough for two of each species of animals, in anticipation of the flood.
3. A large, flat-bottomed or awkward boat: They lived on an ark, or house boat, on the Seine River in Paris.
When Wilbur decided to move off the isolated island, he determined to build an ark to carry his possessions. The builder designed the ark using a long arc shaped bow.
2. The boat god commanded Noah to build for shelter during the Great Flood.
3. A large commodious boat.
4. A place or thing furnishing protection; a refuge.