Is it farther or further?
late 14c., "one to whom divine revelations are made," agent noun from see (v.). Originally rendering Latin videns, Greek bleptor (from Hebrew roeh) in Bible translations (e.g. I Kings ix:9). Literal sense of "one who sees" is attested from early 15c.
a name sometimes applied to the prophets because of the visions granted to them. It is first found in 1 Sam. 9:9. It is afterwards applied to Zadok, Gad, etc. (2 Sam. 15:27; 24:11; 1 Chr. 9:22; 25:5; 2 Chr. 9:29; Amos 7:12; Micah 3:7). The "sayings of the seers" (2 Chr. 33:18, 19) is rendered in the Revised Version "the history of Hozai" (marg., the seers; so the LXX.), of whom, however, nothing is known. (See PROPHET.)