noun Date: 1887 the first-formed xylem developing from procambium and consisting of narrow cells with annular, spiral, or scalariform wall thickenings
PROTOXYLEM
Meaning of PROTOXYLEM in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012