
1) Afroasiatic language 2) Biological pigment 
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https://www.crosswordclues.com/clue/bilin
 [biochemistry]
[biochemistry]  Bilins, bilanes or bile pigments are biological pigments formed in many organisms as a metabolic product of certain porphyrins. Bilin (also called bilichrome) was named as a bile pigment of mammals, but can also be found in lower vertebrates, invertebrates, as well as red algae, green plants and cyanobacteria. Bilins can rang...
Found on 
http://en.wikipedia.org/wiki/Bilin_(biochemistry)

• (n.) A name applied to the amorphous or crystalline mass obtained from bile by the action of alcohol and ether. It is composed of a mixture of the sodium salts of the bile acids.
Found on 
http://thinkexist.com/dictionary/meaning/bilin/

any biological pigment (biochrome) belonging to a series of yellow, green, red, or brown nonmetallic compounds that are formed as a metabolic product ... [1 related articles]
Found on 
http://www.britannica.com/eb/a-z/b/64
 Bi'lin  noun
Bi'lin  noun [ Confer French 
 biline , from Latin 
 bilis bile.] 
 (Physiol. Chem.) A name applied to the amorphous or crystalline mass obtained from bile by the action of alcohol and ether. It is composed of a mixture of the sodium salts of the bile acids. 
Found on 
http://www.encyclo.co.uk/webster/B/51

Type: Term Pronunciation: bī′lin, -līn Definitions: 1. The chain of four pyrrole residues resulting from the cleavage of one bond of one of the four methylidene residues of the porphin part of a porphyrin; specifically, the unsubstituted tetrapyrrole; bilirubin and biliverdin are bilins.
Found on 
http://www.medilexicon.com/medicaldictionary.php?t=10188

bilin A name applied to the amorphous, or crystalline, mass obtained from bile by the action of alcohol and ether. It is composed of a mixture of the sodium salts of the bile acids.
Found on 
http://www.wordinfo.info/words/index/info/view_unit/297/
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