Definition of "excimer" [excimer]

• A diatomic molecule existing in an energy level above the ground state. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The experimental procedure, called photo-refractive keratectomy (PRK) and performed only by ophthalmologists, uses a new "excimer" laser to treat moderate degrees of nearsightedness (myopia)."
• "For mild cases of psoriasis, excimer and pulsed dye laser treatments are used when topical applications cease to be effective."
• "Striae albae the white, shiny scars, can be repigmented with an excimer laser, which emits UVB light that stimulates melanocytes to make more melanin in that area."