GNU Collaborative International Dictionary of English
Found one definition
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Greengill , n. (Zool.) An oyster which has the gills tinged with a green pigment, said to be due to an abnormal condition of the blood.1913 Webster
Greengill , n. (Zool.) An oyster which has the gills tinged with a green pigment, said to be due to an abnormal condition of the blood.1913 Webster