amphiscii

from The Century Dictionary.

• In geography, the inhabitants of the intertropical regions, whose shadows at noon are cast in one part of the year to the north and in the other part to the south, according as the sun is in the southern or the northern signs.

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

• noun plural The inhabitants of the tropic, whose shadows in one part of the year are cast to the north, and in the other to the south, according as the sun is south or north of their zenith.