meta·xy·lem | \ ˌme-tə-ˈzī-ləm 
, -ˌlem \
, -ˌlem \Definition of metaxylem
: the part of the primary xylem that differentiates after the protoxylem and that is distinguished typically by broader tracheids and vessels with pitted or reticulate walls
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Time Traveler for metaxylem
The first known use of metaxylem was in 1894
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