mastné

Mastné is a Czech adjective meaning fatty or greasy. It is used to describe substances with a high fat content, certain foods, or skin that produces excess sebum. The form mastné appears in neuter singular and in many plural contexts, with common phrases such as mastné jídlo (fatty food), mastné potraviny (high‑fat foods), or mastná pleť (oily skin).

In nutrition and science, mastné refers to fats and fat-containing compounds. Mastné kyseliny are fatty acids, which are components of lipids such as triglycerides. Fats are classified by their fatty acids as saturated, monounsaturated, or polyunsaturated; transmastné kyseliny (trans fats) are a distinct category produced by hydrogenation.

In everyday language, mastné is frequently used to describe skin or hair that is oily, as well as foods with a high fat content. For example, "mastná pleť" denotes oily skin, and "mastné mléčné výrobky" refers to dairy products rich in fat. The term also appears in dietary guidance and cosmetics, where it indicates products designed to manage or complement oily conditions.

Etymology and related terms: mastné is derived from masť, meaning fat or grease, which in turn traces to older Slavic roots associated with fats and greases. Related Czech words include tuk (fat) and olej (oil).

See also: masť, tuk, mastné kyseliny, lipidy, transmastné kyseliny, mastná pleť.