"preciser" in the adjective sense
1. precise
sharply exact or accurate or delimited
"a precise mind"
"specified a precise amount"
"arrived at the precise moment"
2. accurate, exact, precise
of ideas, images, representations, expressions) characterized by perfect conformity to fact or truth strictly correct
"a precise image"
"a precise measurement"
Source: WordNet® (An amazing lexical database of English)
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