LIGHTTIGHT
Meaning of LIGHTTIGHT in English
/luyt"tuyt'/ , adj. Chiefly Brit.
lightproof.
[ 1880-85; LIGHT 1 + TIGHT, on the model of WATERTIGHT, AIRTIGHT, etc. ]
Random House Webster's Unabridged English dictionary.
Полный английский словарь Вебстер - Random House .
2012