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This article investigates the role of prescription of linguistic norms in the language of science. Normative rules are applied in order to bring order into this process and to facilitate communication among experts. The paper analyses an example of a lexeme from the field of electronics in Croatian laguage in order to show how different modifiers in multiword lexical units change the conceptual frame of particular terms. These terms behave as polysemous lexemes whose meaning depends on the context and can hardly be prescribed and limited. The author concludes that instead of talking about the prescriptive normative concem,perhaps it would be more precise to talk only about the description of actual linguistic patterns, since language is always a step ahead, always following its own secret ways and creating its own laws.