pent-

Root for treading/path, yielding Latin pōns (bridge) and English find, path, pontiff (bridge-maker).‌​‌​‌​‍​‌​‍​‍​‌​‍​‍​‍​‌​‌​‌​‌​‍​‍​‌​‌​‌​‌​‍​‌​‍​‌​‌​‌​‍​‍​‌​‌​‌

Discussion

The Proto-Indo-European root *pent- meant "to tread, to walk, to go" and produced a surprisingly diverse set of descendants across the Indo-European family.‌​‌​‌​‍​‌​‍​‍​‌​‍​‍​‍​‌​‌​‌​‌​‍​‍​‌​‌​‌​‌​‍​‌​‍​‌​‌​‌​‍​‍​‌​‌​‌ The root conveyed the basic act of walking or treading a path, and its derivatives naturally extended into words for roads, passages, and the act of finding — which in early thought was closely linked to the idea of going forth and encountering.

In the Germanic languages, the root gave rise to Old English pæþ, the direct ancestor of modern English path. The word underwent regular sound changes under Grimm's Law, whereby the Proto-Indo-European voiceless stop *p became the fricative *f in most environments, though in this case the cluster *-nt- produced a somewhat different outcome preserved in the dental consonant of path. The English word find also descends from this root, from the Germanic sense of "to come upon while walking", reflecting the intimate connection between travel and discovery in early Indo-European thought.

Latin inherited the root in the form pontis "bridge" — literally a means of crossing or treading over water — which gave English pontoon and, more remarkably, pontiff. The title Pontifex, originally designating a Roman priest, has been traditionally interpreted as "bridge-builder" (from pons + facere), suggesting a mediator between the human and divine realms, though some scholars dispute this etymology.

In Greek, the root appears in pontos "sea, open water", originally meaning "path" or "crossing" — the sea conceived as a route to be traversed rather than a barrier. This is the source of English Hellespont and the name Pontus. The semantic journey from "treading" through "path" to "sea" and "bridge" illustrates how a single root could radiate into quite different conceptual domains across the daughter languages. Sanskrit pánthāḥ "path, way" preserves the original meaning most transparently and confirms the reconstructed form.