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130 Terms used in Bionomenclature
nm.: see nothomorph.
no., [numero, no]: number; sometimes used in bibliographic citations to
indicate separately published parts of a work.
nobis, [nob.]: (obsol.) by us; formerly sometimes used to indicate that an
author was introducing a name which should be attributed to him or
her; see mihi.
node: (phyl.) a point or vertex on a tree (graph theory); on a phylogenetic
tree, a node is commonly used to represent the split of one lineage to
form two or more lineages (internal node) or the lineage at the
present time (terminal node).
node-based clade: (phyl.) a point or vertex on a tree (graph theory); on a
phylogenetic tree, a node is commonly used to represent the split of
one lineage to form two or more lineages (internal node) or the
lineage at the present time (terminal node).
node-based definition: (phyl.) a definition that associates a name with a
clade originating at a node (on a phylogenetic tree) representing the
most recent common ancestor of specified descendant organisms
and/or species (internal specifiers).
nodum: (phyt., obsol.) a syntaxon rank, not accepted in the Code.
nomen, [nom.; pl. nomina]: name; in nomenclatural practice, some usages
have become more familiar in the singular (e.g. nomen novum),
while others are commonly encountered in the plural (e.g. nomina
conservanda).
nomen abortivum, [nom. abort.]: (obsol.) formerly applied to a name
which at the date of publication was contrary to the Code in
operation at that time.
nomen alternativum, [nom. alt.]: an alternative name (q.v.).
nomen ambiguum, [nom. ambig.]: an ambiguous name (q.v.).
nomen ambiguum rejiciendum, [nom. ambig.; pl. nomina ambigua
rejicienda]: (phyt.) a list of ambiguous names of syntaxa ruled as
not to be used by the Nomenclature Commission (q.v.).