periodic meaning
EN
[pɪ.ɹiˈɒdɪk] [-ɒdɪk] [ˌpɜːraɪˈɒdɪk] 
US 
- AdjectivePREper-
- Relative to a period or periods.
- Having repeated cycles.
- There was some laughter, and Roddle was left free to expand his ideas on the periodic visits of cowboys to the town. “Mason Rickets, he had ten big punkins a-sittin' in front of his store, an' them fellers from the Upside-down-F ranch shot 'em up […].”
- Occurring at regular intervals.
- Periodical.
- (astronomy) Pertaining to the revolution of a celestial object in its orbit.
- (mathematics, stochastic processes, of a state) For which any return to it must occur in multiples of time steps, for some.
- (rhetoric) Having a structure characterized by periodic sentences.
- (chemistry) Relating to, derived from, or designating, the highest oxygen acid (HIO) of iodine.
- Of or derived from a periodic acid.
- Relative to a period or periods.
- More Examples
- Used in the Middle of Sentence
- I put up a wallchart of the periodic table next to the blackboard.
- Used in the Middle of Sentence
Definition of periodic in English Dictionary
- Part-of-Speech Hierarchy
- Adjectives
- Uncomparable adjectives
- Uncomparable adjectives
- Morphemes
- Prefixes
- Words by prefix
- Words prefixed with per-
- Words prefixed with per-
- Words by prefix
- Prefixes
- Adjectives
- en periodical
- en periodically
- en periodicity
- en periodick
- en periodicals
Source: Wiktionary
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Grammatically, this word "periodic" is an adjective, more specifically, an uncomparable adjective. It's also a morpheme, more specifically, a prefixe.