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1. Any of various organic pigments that contain four linearly arranged pyrrole rings.
2. Any of these pigments that are found in red algae and cyanobacteria; a phycobilin.

[Back-formation from phycobilin.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
Dey's done it--yes, en dey was de biggest quality in de whole bilin', too--kings!"
DEY done it--yes, DEY done it; en not on'y jis' common white folks nuther, but de biggest quality dey is in de whole bilin'.
We'll have a clean ship soon of the whole bilin' of 'em."
Everything turned out well, which was a mercy, Hannah said, "For my mind was that flustered, Mum, that it's a merrycle I didn't roast the pudding, and stuff the turkey with raisins, let alone bilin' of it in a cloth."
"Well," said Anthony, reaching for his chequebook, "it was a good bilin' of soap.
'Ang bilin natin dito, just make sure na bukas yan ng 5 a.m.
RAMALLAH, Friday, June 28, 2019 (WAFA) -- Dozens of Palestinians suffocated by tear gas as Israeli forces violently quelled the weekly peaceful march in the village of Bilin, west of the West Bank district of Ramallah, said local sources.
"Sinunod ko lang po ang bilin nila boss, kung hindi kaya mauna, sunod sunod lang kami.
At mahigpit ang bilin sa amin na habaan ang pasensya at gawin lang ang tama," said Cristobal.
Accordingly, Ooredoo Myanmar has gone to Shwegyin township in Bago Region, Bilin township in Mon State and Hpa-An in Kayin State to express concern about the flood situation and show its care for the people, the statement notes.
Similar confrontations were also reported in the towns of Nilin, Bilin, Nabi Saleh and Budrus near Ramallah; in Hebron's Bab al-Zawiya neighborhood; and near the Northern entrance of Bethlehem.