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astigmatism

a·stig·ma·tism

astigmatism

 
pronunciation:
stIg m tih zm
features:
Word Parts
part of speech: noun
definition 1: an irregularity in the curvature of a lens, including that of the eye, that prevents rays of light from meeting in a single focal point, resulting in an indistinct or distorted image.
definition 2: a warped or blurred viewpoint; faulty judgment.
Word Parts
The word astigmatism contains the following part:
a-1, an-1 Greek prefix that means not, without
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Words prefixed with a-1, an-1 are nouns and adjectives. Some are loanwords from Greek (amorphous , atrophy ). Others are English formations, which may attach the prefix to English words of Latin origin (asocial , amoral ) or Greek origin (apolitical). The form a-1 is used before bases beginning with a consonant, while an-1 is used before bases beginning with a vowel.