Mustard Gas Severe irritant and vesicant of skin, eyes, and lungs. It may cause blindness and lethal lung edema and was formerly used as a war gas. The substance has been proposed as a cytostatic and for treatment of psoriasis. It has been listed as a known carcinogen in the Fourth Annual Report on Carcinogens (NTP-85-002, 1985) (Merck, 11th ed).
[1. parted with unwillingly or unintentionally; not to be found; missing; as, a lost book or sheep. 2. parted with; no longer held or possessed; as, a lost limb; lost honor. 3. Not employed or enjoyed; thrown away; employed ineffectually; wasted; squandered; as, a lost day; a lost opportunity or benefit. 5. Having wandered from, or unable to find, the way; bewildered; perplexed; as, a child lost in the woods; a stranger lost in london. 6. Ruined or destroyed, either physically or morally; past help or hope; as, a ship lost at sea; a woman lost to virtue; a lost soul. 7. Hardened beyond sensibility or recovery; alienated; insensible; as, lost to shame; lost to all sense of honor. 8. Not perceptible to the senses; no longer visible; as, an island lost in a fog; a person lost in a crowd. 9. Occupied with, or under the influence of, something, so as to be insensible of external things; as, to be lost in thought. (Science: machinery) lost motion, the difference between the motion of a driver and that of a follower, due to the yielding of parts or looseness of joints. Origin: prop. P. P. Of oe. Losien. see lose.