Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Seven-sided.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having seven sides.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having seven sides.

from The Century Dictionary and Cyclopedia

  • Having seven sides: as, a septilateral figure.

Etymologies

Latin septem, seven; see septet + lateral.
(American Heritage® Dictionary of the English Language, Fourth Edition)
septi- +‎ lateral (Wiktionary)

Examples

  • Within this circle she drew other lines, from angle to angle, forming seven triangles, the bases of which constituted the sides of a septilateral figure.

    Rookwood

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