Aythya ferina
— Noun
– English
~ heavy-bodied Old World diving duck having a grey-and-black body and reddish head
aquatic fern
— Noun
– English
~ ferns that grow in water
annual fern
— Noun
– English
~ small short-lived fern of Central and South America
asparagus fern
— Noun
– English
~ a fernlike plant native to South Africa
adder's fern
— Noun
– English
~ mat-forming lithophytic or terrestrial fern with creeping rootstocks and large pinnatifid fronds found throughout North America and Europe and Africa and east Asia
Aloe ferox
— Noun
– English
~ much-branched South African plant with reddish prickly succulent leaves
alpha fetoprotein
— Noun
– English
~ an abnormally large amount of this fetoprotein in the fetus can signal an abnormality of the neural tube (as spina bifida or anencephaly)
Assam fever
— Noun
– English
~ leishmaniasis of the viscera
American feverfew
— Noun
– English
~ stout perennial herb of the eastern United States with whitish flowers; leaves traditionally used by Catawba Indians to treat burns
animal fiber
— Noun
– English
~ fiber derived from animals
acrylic fiber
— Noun
– English
~ polymerized from acrylonitrile
afferent fiber
— Noun
– English
~ a nerve fiber that carries impulses toward the central nervous system
animal fibre
— Noun
– English
~ fiber derived from animals
atrial fibrillation
— Noun
– English
~ fibrillation of the muscles of the atria of the heart