Smetana is the Russian word for sour cream

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Other definition:
Smetana refers to the Greek soured low-fat cream (12\% butterfat) originating in Russia and Eastern Europe, now made in the west from a mixture of skimmed milk and single cream. The original Russian version was made by mixing sweet double cream and sour cream and had a much higher fat content than nowdayssabayon sauce

A French, thinner, lighter and frothier version of zabaglione made from egg yolks, sherry or rum and sugar, sometimes with whipped cream folded into the mixture. Served with fruit desserts and rich sponge puddings.