haptinen.
/ˈhaptɪn/, U.S. /ˈhæptɪn/ Immunology. Now historical and rare.
In the terminology of Paul Ehrlich: any substance which occurs naturally in body fluids and contains a haptophore; a free side chain (side chain n. 2b) or receptor.
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haptine1900
1900 E. F. Bashford tr. P. Ehrlich in Proc. Royal Soc. 66 448 The sifting of the material obtained by observation is rendered more difficult by the occurrence under normal conditions of a great number of quite unlooked for bodies furnished with haptophore groups and arising from diverse organs, and which we may designate collectively as haptines.
1932 R. T. Hewlett & J. McIntosh Man. Bacteriol. (ed. 9) v. 168 Ehrlich termed the diverse free receptors which occur in the body fluids in various circumstances ‘haptines’.
2009 A. M. Silverstein Hist. Immunol. (ed. 2) vi. 104 The antitoxin molecule was called by Ehrlich a receptor or ‘haptine’ of the first order.
This entry has been updated (OED Third Edition, December 2013; most recently modified version published online March 2022).
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n.1900