fuller's earth
Highly adsorbent (attaches to other substances without any chemical
action) clay-like substance consisting of hydrated aluminum silicates;
used in talcum powders.

fly blister
Blister caused by the vesicating (blistering) body fluid of certain
beetles.

fusiform
Tapered at each end; spindle-shaped.

galatea
Durable, often striped cotton fabric used in making clothing.

galax (beetleweed, coltsfoot, wandflower)
Stemless evergreen perennial plant (Galax urceolata) of the eastern US,
with a rosette of glossy, heart-shaped leaves and small white flowers in
spike-like clusters.

gallic acid
Colorless crystalline compound, C7H6O5, derived from tannin used as a
tanning agent, ink dye, in photography, and paper manufacturing.

gamboge
Brownish or orange resin from trees of the genus Garcinia of
south-central Asia and yielding a golden-yellow pigment.

gaucherie