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From The Collaborative International Dictionary of English v.0.48:
Kamsin \Kam*sin"\, Khamsin \Kham*sin"\, n. [Ar. khams[imac]n, fr. khams[=u]n, oblique case khams[imac]n, fifty; -- so called because it blows for about fifty days, from April till June.] A hot southwesterly wind in Egypt, coming from the Sahara. [Written also Khamseen.] [1913 Webster]