er·uv (ârv, ĕr-)
n. pl. er·u·vin (--vĭn′) or er·u·vim (--vĭm′) or er·uvs
A symbolic enclosure, marked by preexisting walls or by cord or wire strung on posts, nominally converting public space into private space and so permitting activities that would otherwise be prohibited on the Sabbath.
[Post-Biblical Hebrew 'êrûb, verbal noun of 'ērēb, to mix, mingle (from the fact that under Halachic law the separate households in the eruv are considered to be a single household, or mingled ), from Hebrew 'ēreb, mixture; see ʿrb in the Appendix of Semitic roots.]
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