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Webster 1913 Edition

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Noun.

[Ar.

khamsīn

, fr.

khamsūn

, oblique case

khamsīn

, 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

Noun.

Same as

khamsin ‎(plural khamsins)

A hot wind in Egypt which blows (for about 50 days) from the desert, bringing with it sand.
- 1957, Lawrence Durrell, Justine, Faber 1968, p. 121:
  That second spring the khamseen was worse than I have ever known it before or since.