Search Result for "voussoir": 
Wordnet 3.0

NOUN (1)

1. wedge-shaped stone building block used in constructing an arch or vault; 



The Collaborative International Dictionary of English v.0.48:

Voussoir \Vous`soir"\, n. [F., akin to vo[^u]te an arch, a
   vault.] (Arch.)
   One of the wedgelike stones of which an arch is composed.
   [1913 Webster]
   [1913 Webster]


WordNet (r) 3.0 (2006):

voussoir
    n 1: wedge-shaped stone building block used in constructing an
         arch or vault