pulsellum
A posterior flagellum of a zoospore.

pulvinae
plural of pulvinus

pulvini
plural of pulvinus

pulvinus
A joint on a plant leaf or petiole that may swell and cause movement of the leaf or leaflet.

puncta
plural of punctum

punctae
plural of punctum

punctum
A sharp tip of any part of the anatomy; a point or other small area.
A neume representing a single tone.

punctums
plural of punctum

pupa
An insect in the development stage between larva and adult.

pupae
plural of pupa

pupas
plural of pupa

puppa
papa; father

puppas
plural of puppa.

purple dye murex
A medium-sized predatory sea snail of species Haustellum brandaris, which secrets a substance that can be used to make a long-lasting purple dye- Tyrian purple.

purpura
The appearance of red or purple discolorations on the skin that do not blanch when pressure is applied, caused by subdermal bleeding.

purpuras
plural of purpura

purwannas
plural of purwanna

pyramid elimia
Elimia potosiensis, a species of elimia snail.

pyramides
plural of pyramide
plural of pyramis

pyramis
A pyramid.

pyrena
A nutlet resembling a seed, or the stone of a drupe, comprising the endocarp and the kernel.

pyrenae
plural of pyrena

pyrene
A polycyclic aromatic hydrocarbon containing four fused benzene rings; first isolated from coal tar

pyrenes
plural of pyrene

quadrans
A bronze coin of the Roman republic worth one quarter of an as.

quadrantanopsia
quadrantanopia

quadrantanopsias
plural of quadrantanopsia

quadrantes
plural of quadrans

quadrantinopsia
Alternative form of quadrantanopsia.

quadricones
plural of quadricone

quagga mussel
A mussel, Dreissena rostriformis, originally from Ukraine but present as an invasive species in the United States.

quaghog
Alternative form of quahog.

quaghogs
plural of quaghog

quahaug
Alternative form of quahog (“edible hard-shell clam, Mercenaria mercenaria, used in chowders”).

quahog
An edible clam with a hard shell found along the Atlantic Coast of North America, from species Mercenaria mercenaria, formerly Venus mercenaria.
An edible clam with a hard shell found along the Atlantic Coast of North America, from species Mercenaria mercenaria, formerly Venus mercenaria.
A similar edible clam, of species Arctica islandica, found along coasts around the North Atlantic, generally in deeper waters.

quahogs
plural of quahog

queen conch
Aliger gigas, a large edible sea snail.

queen scallop
An edible scallop, species Aequipecten opercularis.

quog
Synonym of quahog.

quogs
plural of quog

quohog
Alternative form of quahog.

quohogs
plural of quohog

rachides
plural of rachis

rachis
The spinal column, or the vertebrae of the spine.
An anatomical shaft or axis in a marine invertebrate.
The central shaft of a feather.
The axis of either a compound leaf, inflorescence, or fern frond.

rachises
plural of rachis

radices
plural of radix

radii
plural of radius

radiolites
plural of radiolite

radius
The long bone in the forearm, on the side of the thumb.
The lighter bone (or fused portion of bone) in the forelimb of an animal.
One of the major veins of the insect wing, between the subcosta and the media; the vein running along the costal edge of the discal cell.
A line segment between any point of a circle or sphere and its center.
The length of this line segment.
Anything resembling a radius, such as the spoke of a wheel, the movable arm of a sextant, or one of the radiating lines of a spider's web.
The minimum eccentricity of any vertex, for a given graph.

radiuses
plural of radius

radix
A root.
The primitive root word or morpheme from which later versions derive; the etymon
The number of distinct symbols used to represent numbers in a particular base, as ten for decimal.

radixes
plural of radix

ram's horn
A plant of species Proboscidea louisianica.
The symbol ɤ.

ram's horn squid
A squid-like cephalopod of species Spirula spirula, the only extant member of its taxonomic order, found in the deep ocean.

ramshorn
A low semicircular work situated in and commanding a ditch.
An ammonite; a fossil cephalopod.
A ramshorn snail.
The horn of a ram.

ramshorn snail
Any member of the Planorbidae, a family of freshwater pulmonate molluscs whose shells are shaped like a ram's horn.

ramshorn snails
plural of ramshorn snail

ramshorns
plural of ramshorn

rasta
Rastafarian
Diminutive of rastaquouère

rastas
plural of rasta

rastella
plural of rastellum

rastellum
In certain mygalomorph spiders, a row of stiff spines on the chelicera.
In honey bees, a row of spines on the distal end of the tibia used to manipulate pollen.

razor shell
Synonym of razor clam.

realia
Objects from real life or from the real world, as opposed to theoretical constructs or fabricated examples.
Words and expressions for culture-specific material elements.
Physical objects in a library collection that do not fit into traditional categories of media, whose media are the objects themselves, as opposed to their informational content, such as artifacts, tools, memorabilia, and naturally-occurring specimens.

red flying squid
Synonym of neon flying squid (“Ommastrephes bartramii”).

red squid
Synonym of neon flying squid (“Ommastrephes bartramii”).

reef squid
Any of various species in the genus Sepioteuthis of squid with large, rounded fins, resembling cuttlefish.

regal sea goddess
Felimare picta, a species of nudibranch, typically with a dark body inscribed with yellow highlights, growing to about 13 cm.

rhabdi
plural of rhabdus

rhabdus
A simple, straight spicule.

rhachides
plural of rhachis

rhachis
Alternative spelling of rachis.

rhachises
plural of rhachis

rhyncholites
plural of rhyncholite

ribbed mussel
Magellan mussel

ribolysis
The hydrolysis of a riboside

ribonucleolysis
The cutting of the internucleotide link in RNA

rimula
A small crack or fissure.

rimulae
plural of rimula

rimule
Alternative form of rimula.

rimules
plural of rimule

river mussels
plural of river mussel

river snail
Any snail of the family Viviparidae.

river snails
plural of river snail

robusta
Any plant of the species Coffea canephora of coffee plants, native to Africa, cultivated widely in Brazil.
Beans, ground roasted beans, or beverage from the robusta coffee bean, used primarily in instant coffee and in blends, with a high caffeine content.

robustas
plural of robusta

rock oyster
Any oyster of the genus Saccostrea, endemic to the western Indo-Pacific.

rotella
A disc.
A round shield.

rudist
Any of many box-, tube- or ring-shaped marine heterodont bivalves from the Jurassic and Cretaceous periods.

rudists
plural of rudist

rumpscuttle
A tomboy; a boyish girl.

rumpscuttles
plural of rumpscuttle

sacella
plural of sacellum

saddle oyster
Synonym of jingle shell.

saddle oysters
plural of saddle oyster

sagenites
plural of sagenite

sankha
A chank (Turbinella pyrum).
A bracelet or necklace made in India from the chank shell.

sarcosepta
plural of sarcoseptum

satsuma
A seedless and easy-peeling cultivar of mandarin orange of Japanese origin; Citrus unshiu.

satsumas
plural of satsuma

saxicava
Any of the marine bivalve shells of the genus Saxicava.

saxicavae
plural of saxicava

saxicavas
plural of saxicava

scabies
An infestation of parasitic mites, Sarcoptes scabiei, causing intense itching caused by the mites burrowing into the skin of humans and other animals. It is easily transmissible from human to human; secondary skin infection may occur.

scala
Ladder; sequence.
Ladder-like structure in the cochlea of a mammal's ear.
A machine formerly used for reducing dislocations of the humerus.

scalae
plural of scala

scalas
plural of scala

scaliola
Archaic form of scagliola.