Question

Based on this etymological information, what is the meaning of the word perigon?
periscope: Greek, peri "around, about, beyond" + skopein "to look at, examine"
horoscope: Greek, hora "year, season, any part of a year" + skopein "to look at, examine"
perimeter: Greek, peri "around, about, beyond" + metron "measure"
hexagon: Greek, hex "six," + gonia "angle"
the measure of six angles in a figure
the measurement of a period of time
the angle in a circle, or a 360-degree angle
something that lasts throughout a year