Absida decrosata:
<ref>Absidă decroşată: absidă mai îngustă decât lăţimea naosului.</ref>,
http://www.erdelyiutazas.hu/romana/telepules/tileagd-1916

Adica recessed, v.
re⋅cess
   /rɪˈsɛs, ˈrisɛs/ Show Spelled Pronunciation [ri-ses, ree-ses] Show IPA Pronunciation
–noun
1. temporary withdrawal or cessation from the usual work or activity.
2. a period of such withdrawal.
3. a receding part or space, as a bay or alcove in a room.
4. an indentation in a line or extent of coast, hills, forest, etc.
5. recesses, a secluded or inner area or part: in the recesses of the palace.
–verb (used with object)
6. to place or set in a recess.
7. to set or form as or like a recess; make a recess or recesses in: to recess a wall.
8. to suspend or defer for a recess: to recess the Senate.
http://dictionary.reference.com/browse/recess

recessed apse, pentru ca exista si altfel, de exemplu abside interioare.
v. http://www.newadvent.org/cathen/01659a.htm

Sunt destul de multe ocurente:
http://www.google.ro/search?hl=ro&q="recessed apse&btnG=Căut...

Important e ca a si fost tradusa asa:
The Wooden Church of Pious Paraskeva, another monument on the Unesco World Heritage List is located in the historical area of Maramures in the Mara River valley. The church dates from 1770 and has preserved much of its original aspect except for the "windows" between the nave and the narthex which were added at a later date. The church is made of wooden beams arranged according to the Blockbau system. The church plan is traditional composed of a nave and narthex in the shape of a rectangle and a sanctuary with a polygonal recessed apse.
http://www.virtourist.com/europe/romania/maramures/12.htm

Mai exista niste ocurente cu 'detached apse', asa, ca alternativa:
http://www.google.ro/search?hl=ro&q="detached apse&btnG=Căut...
the construction plan is the one with a rectangular nave and detached pentagonal apse.
http://tourismbihor.info/index.php?option=com_content&task=v...