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(plant pathology)
A gall resembling a nut.



a gall formed on young branches and leaves of certain species of oak and sumac. Gallnuts form at the sites where the larvae of gall wasps or aphids develop. They are spherical or somewhat elongated excrescences measuring 1.5–2 cm or more in diameter. Gallnuts contain tannins (up to 70 percent of the dry mass), which are used for tanning leather and making pharma ceuticals (for example, astringents).

References in periodicals archive ?
Tenders are invited for Supply of good quality of kankar lime and river sand and brick aggregate gallnut and jaggery from approved place
Gallnut extract is a beneficial natural adjunct in sun care, after-sun care and anti-aging formulations.
Tenders are invited for Supply of 20mm size brick aggregate and kankar lime and riversand gallnut jaggery cr stone and granite stone slabs from approved place inclusive of alla charges