beneath (adv., prep.)

word-forming element of verbs and nouns from verbs, with a wide range of meaning: "about, around; thoroughly, completely; to make, cause, seem; to provide with; at, on, to, for;" from Old English be- "about, around, on all sides" (the unstressed form of bi "by;" see by (prep.)). The form has remained by- in stressed positions and in some more modern formations (bylaw, bygones, bystander).

The Old English prefix also was used to make transitive verbs and as a privative prefix (as in behead). The sense "on all sides, all about" naturally grew to include intensive uses (as in bespatter "spatter about," therefore "spatter very much," besprinkle, etc.). Be- also can be causative, or have just about any sense required. The prefix was productive 16c.-17c. in forming useful words, many of which have not survived, such as bethwack "to thrash soundly" (1550s) and betongue "to assail in speech, to scold" (1630s).

Old English niþera, neoþera "down, downwards, lower, below, beneath," from Proto-Germanic *nitheraz (source also of Old Saxon nithar, Old Norse niðr, which contributed to the English word, Old Frisian nither, Dutch neder, German nieder), from comparative of PIE *ni- "down, below" (source also of Sanskrit ni "down," nitaram "downward," Greek neiothen "from below," Old Church Slavonic nizŭ "low, down").

Also an adverb in Old English and Middle English. It has been replaced in most senses by lower (adj.). Of countries, "situated on lower ground" (late 14c.). In Middle English (and after) used also of body parts.

Absolon hath kist hir nether eye. [Chaucer, "Miller's Tale"]