Of course, this device is properly called the vesica everter.    From Wordnik.com.  [WordPress.com News] Reference

The statues are arranged in five horizontal lines from north to south, exclusive of the figure in the "vesica," the oval above.    From Wordnik.com.  [Bell's Cathedrals: The Cathedral Church of Salisbury A Description of its Fabric and a Brief History of the See of Sarum] Reference

Its floor plan is contained within the proportions of a vesica.    From Wordnik.com.  [Prince Charles Reflects On 'Sacred Geometry'] Reference

The space between the circumference and the vesica is occupied on each side by two angels, with expanded wings, those above issuing from waves, those below kneeling.    From Wordnik.com.  [Bell's Cathedrals: Southwark Cathedral Formerly the Collegiate Church of St. Saviour, Otherwise St. Mary Overie. A Short History and Description of the Fabric, with Some Account of the College and the See] Reference

The footprint of the Cathedral is a vesica piscis (“fish bladder” in Latin), an oval with pointed ends created by the intersection of two circles of the same radius.    From Wordnik.com.  [A Hermeneutic of Rupture?] Reference

As the illustration demonstrates, the centre point of the vesica sits at the very centre of the building so that the North and South doors, seen here on the left and right, are exactly positioned.    From Wordnik.com.  [Prince Charles Reflects On 'Sacred Geometry'] Reference

Purbeck plinths and capitals; the vesica in the tympanum has been filled with stained glass representing St. Etheldreda, the foundress; the original oaken doors have been repaired, faced, and ornamented with scrollwork in iron: this has been effected at a cost of more than.    From Wordnik.com.  [Ely Cathedral] Reference

The pointed oval, or vesica, is the conventionalized form of the fish.    From Wordnik.com.  [The Worship of the Church and The Beauty of Holiness] Reference

It may be that it was derived from that mystical figure of a pointed oval form, the vesica piscis.    From Wordnik.com.  [Literary and General Lectures and Essays] Reference

Above these, on either side of a great vesica enclosing a representation of our Lord, are two shrines, one marked.    From Wordnik.com.  [manybooks.net] Reference

In the tympanum above is represented "Our Lord in Majesty," within a vesica, and surrounded by the evangelistic symbols.    From Wordnik.com.  [Architecture News & Discussion - Archiseek.com] Reference

It is thought by some that the Gothic or pointed arch is derived from this symbol, being simply the upper half of a vesica.    From Wordnik.com.  [The Worship of the Church and The Beauty of Holiness] Reference

Thus the following solution that I give to our puzzle involves the pointed "oval," known among architects as the "vesica piscis.".    From Wordnik.com.  [Amusements in Mathematics] Reference

In the vesica piscis the circumference of one circle goes through the center of another identical circle, representing the overlapping of the inner and outer worlds.    From Wordnik.com.  [American Chronicle] Reference

The slab which once covered the heart shows, within the symbolic vesica, "in a trefoil canopy the half-length figure of the Bishop, mitred and in his episcopal robes, his uplifted hands holding a heart, his pastoral staff represented as resting on his left arm.".    From Wordnik.com.  [Bell's Cathedrals: The Cathedral Church of Winchester A Description of Its Fabric and a Brief History of the Episcopal See] Reference

The west front has over the doorway and its blind arch on either side three very long and narrow two-light windows of equal height, with a cinquefoil in the head of the central window and a quatrefoil in the head of the side windows; whilst above is a vesica, set within a bevelled fringe of bay-leaves, arranged zigzag-wise, with their points in contact -- the last the subject of a well-known rhapsody by Ruskin.    From Wordnik.com.  [Chronicles of Strathearn] Reference

The vesica is bordered with a double dotted line, containing the salutation: "Ave.    From Wordnik.com.  [Bell's Cathedrals: Southwark Cathedral Formerly the Collegiate Church of St. Saviour, Otherwise St. Mary Overie. A Short History and Description of the Fabric, with Some Account of the College and the See] Reference

A vesica, set within a bevilled fringe of bay-leaves arranged zigzagwise, with their points in contact.    From Wordnik.com.  [Scottish Cathedrals and Abbeys] Reference

The Gall-bladder (vesica fellea) (Fig. 1095).    From Wordnik.com.  [XI. Splanchnology. 2i. The Liver] Reference