Noun
metaxylem (countable and uncountable, plural metaxylems)
(biology) The part of xylem, developing after protoxylem, that has larger cells and vessels.
Development Patterns of xylem development: xylem in brown; arrows show direction of development from protoxylem to metaxylem. Source: Internet
The metaxylem is thus on both the peripheral and central sides of the strand with the protoxylem between the metaxylem (possibly surrounded by it). Source: Internet
The protoxylem is thus found in the central core and the metaxylem in a cylinder around it. citation This pattern was common in early land plants, such as " rhyniophytes ", but is not present in any living plants. Source: Internet
Protoxylem and metaxylem As a young vascular plant grows, one or more strands of primary xylem form in its stems and roots. Source: Internet