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Showing results for periodic. Search instead for periodontic.
Definitions

periodic

[peer-ee-od-ik] / ˌpɪər iˈɒd ɪk /
ADJECTIVE
at fixed intervals
Synonyms
STRONGEST
annual intermittent monthly occasional recurrent recurring regular repeated routine seasonal sporadic weekly yearly
STRONG
periodical
WEAK
alternate at various times centennial cyclic cyclical daily epochal every once in a while every so often fluctuating hourly infrequent isochronal isochronous on certain occasions on-again-off-again orbital perennial rhythmic serial spasmodic
Antonyms
STRONGEST
constant infrequent unusual
WEAK
continual irregular lasting permanent sporadic variable

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.