 现代英汉综合大辞典
n.  【化】钠(11号元素, 符号 Na)
现代英汉词典
n. 〈化〉钠（元素符号为： Na）
简明英汉词典
n. [化] 钠
柯林斯英语大词典
sodium 
[ˈsəʊdɪəm]
n a very reactive soft silvery-white element of the alkali metal group occurring principally in common salt, Chile saltpetre, and cryolite. Sodium and potassium ions maintain the essential electrolytic balance in living cells. It is used in the production of chemicals, in metallurgy, and, alloyed with potassium, as a cooling medium in nuclear reactors. Symbol: Na; atomic no: 11; atomic wt: 22.989768; valency: 1; relative density: 0.971; melting pt: 97.81±0.03°C; boiling pt: 892.9°C.(as modifier)
WordNet
sodium Noun 1. a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt) (synonym) , (hypernym) , (substance-holonym) , ,
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