Longman Dictionary of Contemporary English - astigmatism
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Astigmatism
astigmatism
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1.
If someone has astigmatism, the front of their eye has a slightly irregular shape, so they cannot see properly. N-UNCOUNT ...Collins COBUILD Advanced Learner's English Dictionary
2.
noun Date: 1846 1. a defect of an optical system (as a lens) causing rays from a point to fail to meet in a focal point resulting in a blurred and imperfect image 2. a defect of vision due to ~ of the refractive system of the eye and especially to corneal irregularity 3. distorted understanding suggestive of the blurred vision of an astigmatic person ...Merriam-Webster Collegiate Dictionary
3.
n. a defect in the eye or in a lens resulting in distorted images, as light rays are prevented from meeting at a common focus. Derivatives astigmatic adj. Etymology: A-(1) + Gk stigma -matos point ...Толковый словарь английского языка Oxford English Reference
Большой Англо-русский Русско-английский политехнический словарь
Англо-русский Русско-английски словарь по телекоммуникациям
Англо-русский Русско-английский научно-технический словарь
Новый большой англо-русский словарь
Англо-русский словарь
9.
- coined (in form astigmatic) 1849 by English scientist William Whewell (1794-1866), from Gk. a- "without" + stigmatos gen. of stigma "a mark, spot, puncture." ...Английский Этимологический словарь
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