bʰeyd-
“to split, to cleave (blade)”blade/split
PIE root meaning to split or cleave. Yields words for blades, splitting implements, and the act of cleaving.
Discussion
*bʰeyd- is a Proto-Indo-European root meaning "to split" or "to cleave," yielding vocabulary for blades, splitting tools, and the act of separation.
The root gives Latin findere "to split, to cleave" (whence English fissure, fission), with the expected *bʰ > f shift in Latin. Old English bītan "to bite" reflects the Germanic reflex with Grimm's Law (*bʰ > b, *d > t), and the semantic shift from splitting to biting is natural. Sanskrit bhidyate "is split" and bhedana- "splitting" preserve the root transparently.
Germanic *bītaną "to bite" yields English bite, bit, and bitter (originally "biting, sharp"). The tool sense survives in English beetle (the wooden mallet, from *bʰeyd-tlo-). Old High German bīzan and Dutch bijten confirm the Germanic pattern.
The connection between splitting and biting is cross-linguistically common, and both senses are likely original to PIE. Modern reflexes include English bite, bit, bitter, beetle (mallet), and through Latin: fissure, fission, bifid.
Notes
Source of English "bite", "blade" (that which bites). Zero-grade *bʰid-.
Related Roots
English Words from *bʰeyd-
These modern English words descend from this root. Each page traces the full journey from PIE to present-day English.