| 单词 | ectozoon | 
| 释义 | ectozoon in British English (ˌɛktəʊˈzəʊɒn) nounWord forms:  plural -zoa (-ˈzəʊə)  zoology  a parasitic organism that lives on the outside of its host ectozoon in American English (ˌektəˈzouɑn, -ən) nounWord forms: plural -zoa (-ˈzouə) Biology  any animal parasite, as the louse, that lives on the surface of its host (opposed to entozoon)  Also: ectozoan Word origin  [1855–60; ecto- + -zoon]This word is first recorded in the period 1855–60. Other words that entered Englishat around the same time include: barrage, boilerplate, lavabo, output, superheat-zoon is a combining form meaning “animal,” “organism” of the kind specified by the initialelement, often corresponding to zoological class names ending in -zoa, with -zoon used to name a single member of such a class. Other words that use the affix -zoon include: cytozoon, dermatozoon, entozoon, hematozoon, microzoon | 
	
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