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Vocabulary
KEYSTONE - the central stone of an arch or vault.VOUSSOIRS - stones than make the arch (usually brick or wedge-shaped).
IMPOST - the part of the arch's wall (usually molding) on which the arch rests.
ABUTMENT - the part of the arch's wall which balances the force of gravity the arch makes (thrust) .
CENTER - the center point of the arch.
SPAN - the width of the arch's opening.
HAUNCH - the part of the arch's wall which experiences the most thrust.
CROWN - the top part of an arch.
Some arch examples...
 Gothic (Pointed) |  Ogee |  Round |
 Segmental |  Tudor |