RhymeZone: siccar definitions

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Definitions of siccar:

adjective: Alternative spelling of sicker: certain [(obsolete outside dialects) Certain.]
adjective: Alternative spelling of sicker: secure [(obsolete outside dialects) Certain.]
adverb: Alternative spelling of sicker: certainly [(obsolete outside dialects) Certainly.]
adverb: Alternative spelling of sicker: securely [(obsolete outside dialects) Certainly.]

(Definitions from Wiktionary)