I think that it matters what country you are from, American's will probably say it "Layz" due to their dialect of English where as people from NZ, Australia, UK etc will most likely say Laas as is the right way of saying it
Neither. I pronounce it 'lazz', to rhyme with 'jazz'.
Though as it's a shortened form of 'laser' it should be pronounced 'laze' (rhymes with haze).
Though as there are quite complicated phonological rules for pronunciation of vowels in English depending in whether the vowels are followed by single or multiple consonants, it should really be pronounced 'lazz'.
I live in Oklahoma, which is as far away from a GW headquarters or a dictionary as you can possibly be without exiting the lower atmosphere, and I've NEVER heard anyone pronounce it "layz."
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