silesaurid
Any extinct reptile in the family Silesauridae.

silesaurids
plural of silesaurid

silkmoth
Any moth whose caterpillar stage is a silkworm, especially Bombyx mori, the domestic silkmoth, but also others in the families Bombycidae and Saturniidae (as well as the Siberian silkmoth in the family Lasiocampidae).

silkmoths
plural of silkmoth

silphid
Any carrion beetle of the family Silphidae, now subfamily Silphinae.

silphids
plural of silphid

silurid
Any catfish of the Siluridae family.

silurids
plural of silurid

siluroid
Alternative form of silurid.

siluroids
plural of siluroid

silverpatch
A tropical American butterfly of the genus Aides

sinemydid
Any extinct turtle of the family †Sinemydidae

sinemydids
plural of sinemydid

sinsring
Synonym of banxring.

sinsrings
plural of sinsring

sinuitid
Any mollusk in the family Sinuitidae.

sinuitids
plural of sinuitid

sinulariolide
A diterpenoid lactone, (1R,3S,5S,8E,12S,13R)-12-hydroxy-5,9,13-trimethyl-16-methylidene-4,14-dioxatricyclo[11.3.2.03,5]octadec-8-en-15-one, present in soft coral of the genus Sinularia

sinuopeid
Any extinct sea snail in the family Sinuopeidae.

sinuopeids
plural of sinuopeid

siphlonurid
Any mayfly of the family Siphlonuridae.

siphonalean
Any sea snail of the genus Siphonalia

siphonaleans
plural of siphonalean

siphonarian
Any sea snail of the genus Siphonaria.

siphonarians
plural of siphonarian

sipunculan
Any of many unsegmented marine worm-like animals, of the phylum Sipuncula, the peanut worms

sittid
Any bird in the family Sittidae, the nuthatches.

sittids
plural of sittid

sivapithecine
An extinct hominid of the genus †Sivapithecus.

sivapithecines
plural of sivapithecine

sivathere
An extinct giraffid of the genus †Sivatherium.

sivatheres
plural of sivathere

skaracarid
Any maxillopod crustacean of the order Skaracarida

skaracarids
plural of skaracarid

skeneopsid
Any sea snail in the family Skeneopsidae.

skeneopsids
plural of skeneopsid

skunklet
A young skunk.

skunklets
plural of skunklet

slowworm
A small Old World lizard, Anguis fragilis, often mistaken for a snake, having no legs and small eyes.

slowworms
plural of slowworm

smaridid
Any mite in the family Smarididae.

smaridids
plural of smaridid

smilodontine
Any extinct cat of the tribe Smilodontini

smilodontines
plural of smilodontine

smittinid
Any bryozoan in the family Smittinidae.

smittinids
plural of smittinid

snakebird
A darter: any bird of the genus Anhinga.
A wryneck

snakebirds
plural of snakebird

snowcock
Any of several species of bird in the genus Tetraogallus of the pheasant family Phasianidae, native to mountain regions of Eurasia.

snowcocks
plural of snowcock

solenacean
Any member of several species of marine bivalve shells belonging to the family Solenidae.

solenaceans
plural of solenacean

solenid
Any mollusk in the bivalve family Solenidae, the razor shells.

solenids
plural of solenid

solenite
A fossil solen, or razor shell.

solenostomid
Any fish in the family Solenostomidae.

solenostomids
plural of solenostomid

solicitrix
A female solicitor.

solicitrixes
plural of solicitrix

solphugid
Misspelling of solpugid.

solpugid
Any arachnid of the genus Solpuga

solpugids
plural of solpugid

somniosid
Any shark in the family Somniosidae.

somniosids
plural of somniosid

sooglossid
Any frog in the family Sooglossidae.

sooglossids
plural of sooglossid

spalacothere
Any extinct mammal of the family †Spalacotheriidae

spalacotheres
plural of spalacothere

spalacotheriid
Alternative form of spalacothere.

spalacotheriids
plural of spalacotheriid

spaniine
Any fly of the subfamily Spaniinae

spaniines
plural of spaniine

spantagoid
Misspelling of spatangoid.

sparassid
Any spider in the family Sparassidae.

sparassids
plural of sparassid

sparassocynid
Any extinct marsupial of the family Sparassocynidae

sparassocynids
plural of sparassocynid

spartaeine
A jumping spider of the subfamily Spartaeinae.

spartaeines
plural of spartaeine

spatangid
Any sea urchin in the family Spatangidae.

spatangids
plural of spatangid

spatangoid
Any echinoderm of the order Spatangoida, of heart urchins.

spatangoids
plural of spatangoid

spathebothriidean
Any of the order Spathebothriidea of tapeworms that infect the guts of fish.

spathebothriideans
plural of spathebothriidean

speculatrix
A female speculator.

spelaeogriphacean
Any crustacean, of the order Spelaeogriphacea, that inhabit caves

spelaeogriphaceans
plural of spelaeogriphacean

sphaeritid
Any beetle in the family Sphaeritidae.

sphaeritids
plural of sphaeritid

sphaerocerine
Any fly of the subfamily Sphaerocerinae

sphaerocerines
plural of sphaerocerine

sphaeromatid
Any isopod in the family Sphaeromatidae.

sphaeromatids
plural of sphaeromatid

sphaeropsocid
Any barklouse in the family Sphaeropsocidae.

sphaeropsocids
plural of sphaeropsocid

sphenacodont
Any extinct synapsid of the clade Sphenacodontia

sphenacodonts
plural of sphenacodont

sphenodontine
Any tuatara (reptile resembling lizards) of the family Sphenodontidae

sphenodontines
plural of sphenodontine

sphenosuchid
Any extinct crocodylomorph in the family Sphenosuchidae.

sphenosuchids
plural of sphenosuchid

sphexide
Any wasp of the genus Sphex; the digger wasp

sphexides
plural of sphexide

spideress
A female spider.

spideresses
plural of spideress

spilomeline
Any moth of the crambid subfamily Spilomelinae

spilomelines
plural of spilomeline

spintherid
Any polychaete worm of the family Spintheridae.

spintherids
plural of spintherid

spinturnicid
Any mite in the family Spinturnicidae.

spinturnicids
plural of spinturnicid

spionid
Any of the family Spionidae of polychaete worms.

spiraxid
Any snail in the family Spiraxidae.

spiraxids
plural of spiraxid

spiriferinid
Any brachiopod of the family †Spiriferinidae.

spiroceratid
Any extinct cephalopod in the family Spiroceratidae.

spiroceratids
plural of spiroceratid

spirophorid
Any sea sponge of the order Spirophorida.

spirophorids
plural of spirophorid

spirorbid
Any polychaete worm of the genus Spirorbis.

spirorbids
plural of spirorbid

spirulid
A cephalopod of the order Spirulida, including the ram's horn squid.

spirulids
plural of spirulid

spirulirostrid
Any pelagic mollusk of the genus Spirulirostra

spirulirostrids
plural of spirulirostrid

spirurid
Any nematode in the family Spiruridae.

spirurids
plural of spirurid

splanchnotrophid
Any copepod in the family Splanchnotrophidae.

splanchnotrophids
plural of splanchnotrophid

spodopteran
Any moth of the genus Spodoptera.

spodopterans
plural of spodopteran

spongicolid
Any shrimp of the family Spongicolidae

spongicolids
plural of spongicolid

sponsoress
A female sponsor.

sponsoresses
plural of sponsoress

sponsorette
A female sponsor.

sponsorettes
plural of sponsorette

spoonclam
Any bivalve mollusc of the family Periplomatidae

spoonclams
plural of spoonclam

spoonwing
Any neuropteran insect of the family Nemopteridae.

spoonwings
plural of spoonwing

sportellid
Any bivalve mollusk in the family Sportellidae.

sportellids
plural of sportellid

springfish
Any of the fish in the goodeid genus Crenichthys.

squalorajid
Any extinct chimaera in the family Squalorajidae.

squalorajids
plural of squalorajid

squatiniform
Any angel shark of the order Squatiniformes

squatiniforms
plural of squatiniform

squawfish
The pikeminnow.

stagodontid
Any extinct mammal of the family Stagodontidae

stagodontids
plural of stagodontid

stallion
An adult male horse.
An adult male horse.
A very virile and sexually-inclined man or (rarely) woman.

stallions
plural of stallion

standardbred
A breed of horse bred specifically for harness racing

standardbreds
plural of standardbred

staphylinid
Any of the beetle family Staphylinidae, the rove beetles.

staphylinids
plural of staphylinid

steatornithid
Any bird in the family Steatornithidae.

steatornithids
plural of steatornithid

steelworm
Synonym of slowworm

steelworms
plural of steelworm