epitope
UK[ˈepɪtəʊp]US[ˈepɪtoʊp]
n
the specific part of an antigen molecule to which an antibody attaches itself.
Morpheme Breakdown
epi
tope
epi
upon
tope
place
Etymology
the word epitope is a modern scientific coinage, constructed from greek components to precisely describe a concept in immunology. the prefix 'epi-' carries its classical meaning of 'upon' or 'at', while '-tope' derives from 'topos', the greek word for 'place'. thus, the term literally means 'upon a place'. this elegantly reflects its function as the specific site 'upon' the larger antigen molecule where an antibody binds. it was formed in the mid-20th century, following the model of words like 'isotope', to provide a clear, descriptive term for this key immunological site.
Analysis
Structure: epi (upon) + tope (place)
epi (greek, prefix meaning 'upon', 'at', or 'beside'); tope (from greek 'topos', meaning 'place')
Examples
the antibody recognizes a specific epitope on the virus's surface protein.
researchers are mapping the epitopes to develop a more effective vaccine.
a single mutation can alter the epitope, allowing the pathogen to evade the immune system.