Synonym of plumule (“the first bud, or growing point, of a plant embryo, situated above the cotyledons”)
In the obsolete theory of pangenesis propounded by the English scientist Charles Darwin (1809–1882): a hypothetical particle once thought to be the basis of heredity.
Synonym of dendritic spine (“a small membranous protrusion from the dendrite of a neuron that typically receives input from a single axon at the synapse”)
The brown topknot, Notoclinus compressus
The New Zealand topknot, Notoclinus fenestratus
A small European flounder (Phrynorhombus regius, syn. Rhombus punctatus).
A decorative headdress.
A decorative knot of hair on the crown of the head, sometimes having ribbons or feathers.
Several species in the genus Zeugopterus
A crest or knot of feathers upon the head or top, as of a bird.
The Norwegian topknot, Phrynorhombus norvegicus