OpenGL Programming Guide

Glossary

indices

Preferred plural of index. (The choice between the plural forms indices or indexes - as well as matrices or matrixes and vertices or vertexes - has engendered much debate between the authors and principal reviewers of this guide. The authors' compromise solution is to use the -ices form but to state clearly for the record that the use of indice [sic], matrice [sic], and vertice [sic] for the singular forms is an abomination.)

OpenGL Programming Guide