A sense is absent. I don't know which etymology to put it under, so I'll not add it. I have added a citation, though, to citations:rack, q.v.—msh210℠ 18:12, 22 January 2008 (UTC)
Kenya: a car?
I read somewhere that in Kenyan English, "rack" means car. Equinox ◑ 01:22, 2 August 2015 (UTC)
Missing maths sense
See Racks and quandles. Different (and rather interesting) etymology. Equinox ◑ 15:46, 27 August 2015 (UTC)