(physics) The branch of physics that studies the deformation and flow of matter.

Any of various tropical beetles, of the subfamily Dynastinae, having horns on the head and thorax; a pest on coconuts.

A macaque monkey native to southern and southeastern Asia; Macaca mulatta. / (medicine) Alternative form of Rhesus.

A cant used by Cockneys in which a word or phrase is replaced by a rhyming word or phrase, this word or phrase then often being abbreviated to its first syllable or syllables, or its first word. The word chosen as the rhyme often shares attributes of the word that it replaces.

Any plant of the genus Rheum, especially Rheum rhabarbarum, having large leaves and long green or reddish acidic leafstalks that are edible, in particular when cooked (although the leaves are mildly poisonous).

Of the colour of rhubarb: either brownish-yellow (the colour of rhubarb rhizomes and roots used for medicinal purposes), or pale red (often the colour of the leafstalks of common rhubarb).

(Britain, military, aviation) Of fighter aircraft: to fire at a target opportunistically.

(originally theater, uncountable) General background noise caused by several simultaneous indecipherable conversations, which is created in films, stage plays, etc., by actors repeating the word rhubarb; hence, such noise in other settings.

(intransitive, originally theater) Of an actor in a film, stage play, etc.: to repeat the word rhubarb to create the sound of indistinct conversation; hence, to converse indistinctly, to mumble.

The smallest state of the United States, formerly officially State of Rhode Island and Providence Plantations. / The official name of Aquidneck Island.