hecatompedon

from The Century Dictionary.

• noun A building 100 feet in length or width; particularly, the cella of the great temple of Athena, the Parthenon, at Athens. See cut under cella.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Arch.) A name given to the old Parthenon at Athens, because measuring 100 Greek feet, probably in the width across the stylobate.