[1] : The Collaborative International Dictionary of English v.0.48

lakh \lakh\, n.
   same as lac, one hundred thousand.
   1913 webster
see also:
lac 

[2] : The Collaborative International Dictionary of English v.0.48

lac \lac\ la^k, lakh \lakh\ laumk, n. hind. lak,
   l=akh, l=aksh, skr. laksha a mark, sign, lakh.
   one hundred thousand; also, a vaguely great number; as, a lac
   of rupees. written also lack. east indies
   1913 webster
see also:
lack 

[3] : WordNet (r) 2.0

lakh
     n : the cardinal number that is the fifth power of ten syn: hundred
         thousand, 100000
see also:
hundred thousand 100000 

Lakh >> L Words
Lakh, definition of term: Lakh
lakh_pag1.html