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iris (usually irises, but iris can be the plural for multiple plants; in medical contexts irides is used, see § Irregular plurals from Latin and Greek below) series, species (and other words in -ies, from the Latin fifth declension) [The word specie refers only to money, coins, from the Latin ablative singular form in the phrase in specie. It ...
Iris is a flowering plant genus of 310 accepted species [1] with showy flowers.As well as being the scientific name, iris is also widely used as a common name for all Iris species, as well as some belonging to other closely related genera.
It may be that some nouns are not marked for plural at all, like sheep and series in English. In languages which also have a case system, such as Latin and Russian, nouns can have not just one plural form but several, corresponding to the various cases. The inflection might affect multiple words, not just the noun; the noun itself need not ...
Also defined: ramus (plural: rami). The individual structures growing out of the shaft that collectively make up the vanes of the feathers, more or less interconnected by the hooklets of the barbules, extending from each side of the distal part of the feather's shaft known as the rachis. The central axis of a barb is known as the ramus. [8 ...
The Latin word vīrus was a neuter noun of the second declension, but neuter second declension nouns ending in -us (rather than -um) are rare enough that inferring rules is difficult. (One rare attested plural, pelage as a plural of pelagus, is borrowed from Greek, so does not give guidance for virus.)
Plural number is often said to mean more than one, [24] but, in fact, it restricts the denotation of the noun to the set of non-singularities. That is, in English, plural nouns are appropriate for quantities denoted by all the real numbers, including 0 and other quantities smaller than 1, except exactly ±1.
The iris consists of two layers: the front pigmented fibrovascular layer known as a stroma and, behind the stroma, pigmented epithelial cells.. The stroma is connected to a sphincter muscle (sphincter pupillae), which contracts the pupil in a circular motion, and a set of dilator muscles (dilator pupillae), which pull the iris radially to enlarge the pupil, pulling it in folds.
A plural of a countable noun should never be treated as a partial title match when determining primary topic. Encyclopedic uses are given more weight than dictionary uses, per WP:NOTADICTIONARY . This may mean that if there is not an article at the singular form, it is more likely that a plural form can establish a separate primary topic.