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properdin

British

/ ˈprəʊpədɪn /

noun

immunol a protein present in blood serum that, acting with complement, is involved in the destruction of alien cells, such as bacteria

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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properdin

Saul and Drew have both since recovered but take daily antibiotics after tests revealed they both had properdin deficiency - a rare immunodeficiency which means they are more susceptible to infections such as meningitis.

From BBC ● Sep. 29, 2026

Perhaps equally important in the atomic age, properdin seems to increase the body's resistance to the infections that so often follow overexposure of the body to radiation.

From Time Magazine Archive

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023