chlam·y·do·zo·on I. \ˌ ̷ ̷ ̷ ̷ ̷ ̷ˈzōˌän\ Etymology: New Latin, from chlamyd- + -zoon synonym of chlamydia II. noun (pluralchlamydo·zoa \-ˈzōə\) 1.: inclusion body 2.: any of certain microorganisms related to the typical rickettsias; especially: an organism of the family Chlamydiaceae