Perimetrical

Part of speech: adjective

Definitions

1. Of or relating to the outer edge, boundary, or circumference of a shape or area
2. Concerning the outer limit or perimeter that encloses or surrounds something
3. Pertaining to the outer edge or boundary line that marks the extent of an object or region

Etymology: In Greek, "perimetron" was a compound of "peri," meaning "around," and "metron," meaning "measure." Together they described the measure of the distance around a shape. The same "metron" root gives English "meter," "metric," and "thermometer," so "perimetrical" shares its core with much of the scientific vocabulary that measures length, heat, and time. English took the noun "perimeter" from Latin, which had borrowed the Greek term. "Perimetrical" is a later English adjective, built by adding the suffix "-ical" to that noun, a pattern common in technical vocabulary. Its sense is "of or relating to a perimeter," and it is much less common than the noun. Writers in geometry, military contexts, and some scientific fields have used it, most often when describing boundaries or outer edges of an area.