
1) Crystalline compound
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https://www.crosswordclues.com/clue/acridine

Acridine is an organic compound and a nitrogen heterocycle with the formula C13H9N. Acridines are substituted derivatives of the parent ring. It is a planar molecule that is structurally related to anthracene with one of the central CH groups is replaced by nitrogen. Like the related molecule pyridine and quinoline, acridine is mildly basic. It is...
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http://en.wikipedia.org/wiki/Acridine

C13H9N Molar mass: 179.21726
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http://www.convertunits.com/molarmass/Acridine

10-azaanthracene;a dye, dye intermediate, and antiseptic precursor (9-aminoacridine, acriflavine, proflavine hemisulfate derived from coal tar and irritating to skin and mucous membranes. ... Synonym: dibenzopyridine. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

(ak´rĭ-dēn) an alkaloid from anthracene, the basis of certain dyes and drugs.
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http://www.encyclo.co.uk/local/21001

Type: Term Pronunciation: ak′ri-dēn Definitions: 1. A dye, dye intermediate, and antiseptic precursor (9-aminoacridine, acriflavine, proflavine hemisulfate) derived from coal tar and irritating to skin and mucous membranes; a potent mutagen. Synonyms: dibenzopyridine
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http://www.medilexicon.com/medicaldictionary.php?t=789

Acridine is an organic compound with the formulae c13h9n used in dyes and drugs.
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http://www.probertencyclopaedia.com/browse/GA.HTM

acridine A dye, dye intermediate, and antiseptic precursor derived from coal tar and irritating to the skin and to the mucous membranes.
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http://www.wordinfo.info/words/index/info/view_unit/12/

a colorless, crystalline solid, CHN, usually obtained from the anthracine fraction of coal tar: used chiefly in the synthesis of dyes and drugs.
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https://www.infoplease.com/dictionary/acridine
No exact match found.