phylum. 1  Biology. the primary subdivision of a taxonomic kingdom, grouping together all classes of organisms that have the same body plan. 2  Linguistics. a category consisting of language stocks that, because of cognates in vocabulary, are considered likely to be related by common origin. Compare stock (def 13).
There are between 500 and 600 lymph nodes in the average adult human body.
How many lymph nodes are removed depends just as much on your normal anatomy as it does on the surgeon's and pathologist's skill. Every woman has a different number of lymph nodes under her armâsome may only have five nodes and others may have more than 30.