According to the Hutchinson Encyclopaedia, it seems as if s.v is also the appropriate abbreviation in English: "sub voce, under that word; in the place where that subject is considered (abbreviated as s.v.)"
Confirmed also by Douglas Harper's online etymological dictionary: "1859, from L., lit. 'under the word or heading.' Usually abbreviated s.v"

Whether or not s.v. is only used in connection with alphabetically arranged reference works I don't know, but a concordance is such a work anyway...

My trusty Chicago Manual of Style (the Essential Guide for Writers, Editors and Publishers) has 2 listings for s.v.

#1:
14.32
....
Purely scholarly abbreviations such as ibid., cf. and s.v. are preferably used only in notes and other forms of scholarly apparatus.

15.293
.....
References to an encyclopedia, dictionary, or other alphabetically arranged word cite the item (not the volume or page number) preceded by s.v. (sub verbo, "under the word")
Examples: Encyclopedia Britannica, 11 ed,. s.v. "original package"
Webster's New International Dictionary, 3d ed., s.v. "epistrophe."
Columbia Encyclopedia, 4th ed., s.v. "cold war"
Dictionary of American Biography, s.v. "Wadsworth, Jeremiah."


Don't see why you couldn't use s.v.