any unit used in linear measurement, as the inch, foot, meter, etc. Origin of linear measure. 1885-1890. First recorded in 1885-90.
Realistically, you could put any icing you wanted on a carrot cake. The wonderful beauty of cooking is that you can make it to your liking. But, the traditional icing that most people put on carrot cake is cream cheese icing.
Mix in more milk or powdered sugar as needed. If the icing appears too thick to be easily spread on the cake, add 1 tbsp. milk at a time, mixing until the icing is spreadable. If the icing seems too thin, mix in more powdered sugar in small amounts until it reaches the desired consistency. Color the icing, if desired.