Abstract–The use of the enamel surface terms perikymata and imbrications/imbrication lines in the dental literature is inconsistent and therefore confusing. Based on an analysis of these terms and their original use, the following system for their future use is recommended: the whole pattern of ridges and grooves on the enamel surface is termed perikymata or imbrications. Distinction between the two elements of the pattern is attained by adding ridge/crest or groove/furrow. In such combination terms perikymata should be used in its singular form, perikyma, e.g. perikyma ridg