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happy event
happy-go-lucky
happy hard core
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Hapsburg
hapten
hapteron
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hapten

hap·ten [ háp tèn ] (plural hap·tens) or hap·tene [ háp tn ] (plural hap·tenes)


noun 
Definition:
 
partial antigen: an antigen that can only stimulate antibody production when combined with a specific protein

[Early 20th century. < Greek haptein "fasten"]
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