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sub·phy·lum | \ ˈsəb-ˌfī-ləm 
\
\Definition of subphylum
: a category in biological classification ranking below a phylum and above a class
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subphylum
nounsub·phy·lum | \ ˈsəb-ˌfī-ləm \
\ plural subphyla\ -lə \
\Medical Definition of subphylum
: a category in biological classification ranking below a phylum and above a class
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Time Traveler for subphylum
The first known use of subphylum was in 1869
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