periodických
Periodických is the genitive plural form of the Czech adjective periodický, meaning periodic. In Czech, adjectives agree with the nouns they modify in gender, number, and case, so periodických appears when the noun is plural and in the genitive case. This form is typical for adjectives ending in -ický and is used across various domains, including science, literature, and everyday language, whenever a plural noun is described as having a regular or repeating interval or cycle.
Etymology and meaning: The root period- derives from Latin and Greek concepts of a period or cycle,
Usage in sentences: The form appears in phrases such as periodických tabulek (of periodic tables), periodických
Grammar notes: periodických is an inflected adjective form and cannot function as a stand-alone noun. Its citation
See also: periodický, periodic table, periodic function, Czech grammar.