کس

From Middle Persian AYŠ (kas, “person, somebody”).

• (Iranian Persian) IPA^(key): [kʲæs]

کس • (kas) (plural کسان‎ (kasân))

1. (archaic) person
2. somebody

• کسی‎ (kasi)
• هیچ‌کس‎ (hich-kas)

From Proto-Indo-European *kuḱis (“(female) pubic hair; vulva”). Cognate with Lithuanian kūšỹs (“pubic hair, vulva”) and Latvian kūsis (“public hair, vulva”). Possibly an euphemism from the older meaning "belly", preserved in Sanskrit कुक्षि (kukṣí, “belly”).

• (Iranian Persian) IPA^(key): [kʰos]

کس • (kos) (plural کس‌ها‎ (kos-hâ))

1. (vulgar, slang) pussy, cunt, fanny

   ‏با شور و نشاط کسشو می‌لیسید.‎‎

   Bâ šur o nešât koseš-o mi-lisid. (colloquial)

   He vigorously licked her pussy.

2. (slang) an attractive girl or woman

• Mallory, J. P.; Adams, D. Q., editors (1997) Encyclopedia of Indo-European culture, London, Chicago: Fitzroy Dearborn Publishers, page 507

کس • (kis)

1. Indirect form of کیا‎ (kyā).
2. Indirect form of کون‎ (kaun).