Thalassoid (`sea-like`, from θάλασσα — `sea` and εἶδος — `appearance`) is large impact structure on the Moon, similar in size to lunar maria, but without (or with small amount of) dark lava filling. Instead of this, thalassoids are dotted by lots of smaller craters like their surroundings. When the Moon is full (and the shad...
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http://en.wikipedia.org/wiki/Thalassoid
thalassoid Freshwater organisms resembling, or originally, marine forms; halolimnic (marine organisms modified to live in fresh water).
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http://www.wordinfo.info/words/index/info/view_unit/1455/20
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