American Heritage Dictionary
(1)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
[457] But in the Roman pontifical law this idea is hardly discernible, and the only trace I can find of it is a statement of Festus that the soldiers who followed the general's car in a triumph wore laurel wreaths "ut quasi purgati a caede humana intrarent urbem.— The Religious Experience of the Roman People From the Earliest Times to the Age of Augustus
Jerton was beckoned by a waiter to the only vacant table that was discernible, and took his seat with the uncomfortable and wholly groundless idea that nearly every one in the room was staring at him.— Beasts and Super-Beasts
It was the largest structure discernible, and upon its red roof, in enormous white letters, was his own name.— The Octopus : A story of California
From the top of a tree hills in the distance to north and south of east discernible--rising ground near, which I will make for in the morning.— McKinlay's Journal of Exploration in the Interior of Australia
Outlines began to be darkly discernible, the moon's silver mirror was shivered by lances of gold.— Up the Hill and Over

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word a few times a month.
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