elementary body
noun
el·e·men·ta·ry body
| \ ˌel-ə-ˌment-ə-rē-, -ˌmen-trē-
\
\
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