Olmecan.

1787 C. Cullen tr. F. S. Clavigero Hist. Mexico I. ii. 103 The Olmecas [It. Olmechi] and the Xicallancas, whether one nation, or two distinct nations, but constantly allied and connected together, were so ancient in the country of Anahuac, that many authors account them prior to the Toltecas.

1867 Edinb. Rev. 125 337 They had wrested the territory of Anahuac from a powerful nation called the Ulmecas, or Olmecas, who, in their turn, had displaced the Quinámes, a fabulous race of giants.

1883 Proc. Amer. Antiquarian Soc. 2 193 (heading) The Olmecas and the Tultecas: a study in early Mexican ethnology and history.

1931 G. Mason Columbus came Late xi. 238 The Olmeca people that inhabited the damp country of southern Vera Cruz and western Tabasco.

1964 C. Gibson Aztecs under Spanish Rule 9 The most important migrant peoples pertinent to Valley [of Mexico] history in the Post-Classic or late pre-colonial period were the Olmeca, Xicalanca, Tolteca, Chichimeca, Teochichimeca, Otomi... The first five of these were historically extinct, absorbed, or expelled by the time of the arrival of Europeans.

2001 Color Lines (Nexis) Spring 34 As Raza we can claim our own antiquity with ancestors who go back many centuries in Mexico: the Olmeca, Maya, Tolteca, you name it.

1976 Current Anthropol. 17 445/1 We often find in the Americas similarities of cultural elements among distantly separated regions and even times... Another example is the possible relationship between Olmeca and Chavin.

1997 A. Cambeira Quisqueya La Bella 84 Could these pre-Columbian people, the ancient Olmeca..have come from the east in seafaring vessels in order to settle in the Nuevo Mundo?