Erayga "cagaaran" waa eray qadiimi ah oo waagii hore loo adeegsan jiray in lagu qeexo xaalad inta badan saamaysay dumarka da'da yar, taasoo lagu garto midab cirro, daciifnimo, iyo rabitaanka cuntada dhanaan ama aashitada. Xaaladdan waxa kale oo loo yaqaanay chlorosis, oo ka soo jeeda ereyga Giriigga "khloros," oo macneheedu yahay cagaar-huruud ama cirro. sida cudur gaar ah. Si kastaba ha ahaatee, ereyga waxaa laga yaabaa in weli loo isticmaalo suugaanta ama taariikhda taariikheed si loo tixraaco calaamadaha kor lagu sharaxay.