Plural Nouns Starting with R

Radiata (n. pl.) An extensive artificial group of invertebrates, having all the parts arranged radially around the vertical axis of the body, and the various organs repeated symmetrically in each ray or spheromere.

Radio-flagellata (n. pl.) A group of Protozoa having both flagella and pseudopodia.

Radiolaria (n. pl.) Order of rhizopods, usually having a siliceous skeleton, or shell, and sometimes radiating spicules. The pseudopodia project from the body like rays. It includes the polycystines. See Polycystina.

Radioli (n. pl.) The barbs of the radii of a feather; barbules.

Raiae (n. pl.) The order of elasmobranch fishes which includes the sawfishes, skates, and rays; -- called also Rajae, and Rajii.

Ramenta (n. pl.) Thin brownish chaffy scales upon the leaves or young shoots of some plants, especially upon the petioles and leaves of ferns.

Rapaces (n. pl.) Same as Accipitres.

Raphides (n. pl.) See Rhaphides.

Rapilli (n. pl.) Lapilli.

Raptores (n. pl.) Same as Accipitres. Called also Raptatores.

Ratitae (n. pl.) An order of birds in which the wings are small, rudimentary, or absent, and the breastbone is destitute of a keel. The ostrich, emu, moa, and apteryx are examples.


Ratlins (n. pl.) The small transverse ropes attached to the shrouds and forming the steps of a rope ladder.

Rattlings (n. pl.) Rat

Regalia (n. pl.) That which belongs to royalty. Specifically: (a) The rights and prerogatives of a king. (b) Royal estates and revenues. (c) Ensings, symbols, or paraphernalia of royalty.

Regalia (n. pl.) Hence, decorations or insignia of an office or order, as of Freemasons, Odd Fellows,etc.

Regalia (n. pl.) Sumptuous food; delicacies.

Regimentals (n. pl.) The uniform worn by the officers and soldiers of a regiment; military dress; -- formerly used in the singular in the same sense.

Regularia (n. pl.) A division of Echini which includes the circular, or regular, sea urchins.

Reins (n. pl.) The kidneys; also, the region of the kidneys; the loins.

Reins (n. pl.) The inward impulses; the affections and passions; -- so called because formerly supposed to have their seat in the part of the body where the kidneys are.

Rejectamenta (n. pl.) Things thrown out or away; especially, things excreted by a living organism.

Reliquiae (n. pl.) Remains of the dead; organic remains; relics.

Reliquiae (n. pl.) Same as Induviae.

Remiges (n. pl.) The quill feathers of the wings of a bird.

Reprizes (n. pl.) See Reprise, n., 2.

Reptantia (n. pl.) A division of gastropods; the Pectinibranchiata.

Reptilia (n. pl.) A class of air-breathing oviparous vertebrates, usually covered with scales or bony plates. The heart generally has two auricles and one ventricle. The development of the young is the same as that of birds.

Reticularia (n. pl.) An extensive division of rhizopods in which the pseudopodia are more or less slender and coalesce at certain points, forming irregular meshes. It includes the shelled Foraminifera, together with some groups which lack a true shell.

Reticulosa (n. pl.) Same as Reticularia.

Retitelae (n. pl.) A group of spiders which spin irregular webs; -- called also Retitelariae.

Rhabdocoela (n. pl.) A suborder of Turbellaria including those that have a simple cylindrical, or saclike, stomach, without an intestine.

Rhabdophora (n. pl.) An extinct division of Hydrozoa which includes the graptolities.

Rhachiglossa (n. pl.) A division of marine gastropods having a retractile proboscis and three longitudinal rows of teeth on the radula. It includes many of the large ornamental shells, as the miters, murices, olives, purpuras, volutes, and whelks. See Illust. in Append.

Rhaphides (n. pl.) Minute transparent, often needle-shaped, crystals found in the tissues of plants.

Rheae (n. pl.) A suborder of struthious birds including the rheas.

Rheumides (n. pl.) The class of skin disease developed by the dartrous diathesis. See under Dartrous.

Rhipidoglossa (n. pl.) A division of gastropod mollusks having a large number of long, divergent, hooklike, lingual teeth in each transverse row. It includes the scutibranchs. See Illustration in Appendix.

Rhizocephala (n. pl.) A division of Pectostraca including saclike parasites of Crustacea. They adhere by rootlike extensions of the head. See Illusration in Appendix.

Rhizophaga (n. pl.) A division of marsupials. The wombat is the type.

Rhizopoda (n. pl.) An extensive class of Protozoa, including those which have pseudopodia, by means of which they move about and take their food. The principal groups are Lobosa (or Am/bea), Helizoa, Radiolaria, and Foraminifera (or Reticularia). See Protozoa.

Rhizostomata (n. pl.) A suborder of Medusae which includes very large species without marginal tentacles, but having large mouth lobes closely united at the edges. See Illust. in Appendix.

Rhomboganoidei (n. pl.) Same as Ginglymodi.

Rhopalocera (n. pl.) A division of Lepidoptera including all the butterflies. They differ from other Lepidoptera in having club-shaped antennae.

Rhynchobdellea (n. pl.) A suborder of leeches including those that have a protractile proboscis, without jaws. Clepsine is the type.

Rhynchocephala (n. pl.) An order of reptiles having biconcave vertebrae, immovable quadrate bones, and many other peculiar osteological characters. Hatteria is the only living genus, but numerous fossil genera are known, some of which are among the earliest of reptiles. See Hatteria. Called also Rhynchocephalia.

Rhynchocoela (n. pl.) Same as Nemertina.

Rhynchophora (n. pl.) A group of Coleoptera having a snoutlike head; the snout beetles, curculios, or weevils.

Rhynchota (n. pl.) Same as Hemiptera.

Rickets (n. pl.) A disease which affects children, and which is characterized by a bulky head, crooked spine and limbs, depressed ribs, enlarged and spongy articular epiphyses, tumid abdomen, and short stature, together with clear and often premature mental faculties. The essential cause of the disease appears to be the nondeposition of earthy salts in the osteoid tissues. Children afflicted with this malady stand and walk unsteadily. Called also rachitis.

Rostra (n. pl.) See Rostrum, 2.

Rostrifera (n. pl.) A division of pectinibranchiate gastropods, having the head prolonged into a snout which is not retractile.

Rotatoria (n. pl.) Same as Rotifera.

Roughings (n. pl.) Rowen.

Roughstrings (n. pl.) Pieces of undressed timber put under the steps of a wooden stair for their support.

Rudistes (n. pl.) An extinct order or suborder of bivalve mollusks characteristic of the Cretaceous period; -- called also Rudista. See Illust. under Hippurite.

Rugosa (n. pl.) An extinct tribe of fossil corals, including numerous species, many of them of large size. They are characteristic of the Paleozoic formations. The radiating septs, when present, are usually in multiples of four. See Cyathophylloid.

Rullichies (n. pl.) Chopped meat stuffed into small bags of tripe. They are cut in slices and fried.

Ruminantia (n. pl.) A division of Artiodactyla having four stomachs. This division includes the camels, deer, antelopes, goats, sheep, neat cattle, and allies.

Rurales (n. pl.) The gossamer-winged butterflies; a family of small butterflies, including the hairstreaks, violets, and theclas.

About the author

Mark McCracken

Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English".

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