annular thickening

annular thickening defined in 1951 year

annular thickening - annular thickening;
annular thickening - Internal thickening of wall of a xylem vessel or tracheid, in form of rings at intervals along its length. Occurs in cells of protoxylem and, whilst providing mechanical support, permits longitudinal stretching as neighbouring cells grow.

near annular thickening in Knolik

annual ringhome
letter "A"
start from "AN"

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