el·e·men·ta·ry body | \ ˌel-ə-ˌment-ə-rē-, -ˌmen-trē- 
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\Medical Definition of elementary body
: an infectious particle of any of several microorganisms especially : a chlamydial cell of an extracellular infectious form that attaches to receptors on the membrane of the host cell and is taken up by endocytosis — compare reticulate body
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