pervalvar axis

noun
per·valvar axis | \¦pər, (ˈ)per+...-\

Definition of pervalvar axis 

: the longitudinal axis of the frustule of a diatom

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History and Etymology for pervalvar axis

per- + valvar

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peruvian yellow

perv

pervade

pervalvar axis

pervaporate

pervasion

pervasive

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