A variant or archaic spelling of 'crystallize'; to form into crystals or become clear and defined, especially regarding ideas or thoughts.
From 'crystal' + '-ize' (verb-forming suffix), an older spelling before 'crystallize' with double-l became standardized in English.
This alternate spelling shows English's 'spelling chaos'—dictionaries used to accept both 'crystalize' and 'crystallize,' but modern style guides killed off the shorter version without an official vote!
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