| Snellen chart |
display consisting of a printed card with letters and numbers in lines of decreasing size; used to test visual acuity
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| Snellen test |
a test of visual acuity using a Snellen chart
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| snail |
freshwater or marine or terrestrial gastropod mollusk usually having an external enclosing spiral shell escargot: edible terrestrial snail usually served in the shell with a sauce of melted butter and garlic gather snails; "We went snailing in the summer"
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| snowblindness |
temporary blindness caused by exposure to sunlight reflected from snow or ice
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| snake |
limbless scaly elongate reptile; some are venomous a deceitful or treacherous person move smoothly and sinuously, like a snake a tributary of the Columbia River that rises in Wyoming and flows westward; discovered in 1805 by the Lewis and Clark Expedition Hydra: a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer form a snake-like pattern; "The river snakes through the valley" something long, thin, and flexible that resembles a snake move along a winding path; "The army snaked through the jungle"
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