oleaster
A plant in the family Elaeagnaceae,
A plant in the family Elaeagnaceae,
A plant in the family Elaeagnaceae,
Cultivated olive trees that have re-naturalized, sometimes treated as a species Olea oleaster, the wild olive.

oleoptene
Alternative form of elaeoptene.

oleoptenes
plural of oleoptene

oleosome
Synonym of spherosome.

oleosomes
plural of oleosome

oligophagism
Synonym of oligophagy.

oligophagy
Feeding on few specific types of food (e.g. a single plant genus or family).

olivin
A complex bitter gum found on the leaves of the olive tree.

olivite
olivin
A tough rubber compound that becomes very slippery when wet.

ollah
Alternative form of olay.

ollahs
plural of ollah

ollay
Alternative form of olay.

ololiuhqui
A Latin American morning glory (Ipomoea corymbosa, syns. Turbina corymbosa, Rivea corymbosa) whose seeds are hallucinogenic.

olusatrum
An umbelliferous plant, the common alexanders, found in Western Europe (Smyrnium olusatrum).

ombrophil
Alternative form of ombrophile.

ombrophile
Any plant that flourishes in a rainy environment.

ombrophiles
plural of ombrophile

ombrophils
plural of ombrophil

ombrophyte
Any plant that is adapted to rainy conditions or habitats

ombrophytes
plural of ombrophyte

ombu
Phytolacca dioica, a massive spreading evergreen tree native to the pampas of South America.

ombus
plural of ombu

omikuji
A random fortune, often written on a strip of paper or on a stick of bamboo, available at Japanese shrines in exchange for a small offering.

onagrad
Any plant of the family Onagraceae

onagrads
plural of onagrad

onaye
Alternative form of inee.

oneberry
Paris quadrifolia, herb paris.

ongaonga
The plant Urtica ferox, a nettle endemic to New Zealand with woody stem and large stinging spines.

ongaongas
plural of ongaonga

onionet
A small onion.

onionets
plural of onionet

onocerin
A white crystalline waxy substance extracted from the root of the leguminous plant spiny restharrow (Ononis spinosa).

onocerins
plural of onocerin

onosma
Any flowering plant of the genus Onosma, of the family Boraginaceae.

ooplast
Synonym of oosphere.
Misspelling of ooblast.

ooplasts
plural of ooplast

oorali
Alternative form of wourali.

oorari
curare

oosphere
A large nonmotile egg cell, especially of an alga or fungus, formed in an oogonium and ready for fertilization.

oospheres
plural of oosphere

oospore
A fertilized female zygote, having thick chitinous walls, that develops from a fertilized oosphere in some algae and fungi

oospores
plural of oospore

ootheca
An egg case of any of the orthopteroid insects (such as cockroaches and mantids).
The theca or sporangium of ferns.

oothecae
plural of ootheca

opacite
A small, dark grain, of doubtful origin, in an igneous rock

opacites
plural of opacite

opeh
betel palm; areca palm

opepe
Synonym of bilinga (tropical hardwood)

ophioglossid
An adder's tongue fern, or one similar to such a fern.

ophioglossids
plural of ophioglossid

ophiopogon
Any evergreen plant of the genus Ophiopogon

ophiopogons
plural of ophiopogon

opoponax
Alternative form of opopanax.

opseospermata
Tubercles on the surface of some algae containing spores.

opuntioid
Any cactus of the subfamily Opuntioideae

opuntioids
plural of opuntioid

orange-ball-tree
A plant of species Buddleja globosa, native to Chile and Argentina.

orangeberries
plural of orangeberry

orangeberry
A shrub native to Australia and Southeast Asia, related related to citrus and having small pink, citrus-like fruits, Glycosmis pentaphylla.

orangeblossom
Uncommon form of orange blossom.

orangeblossoms
plural of orangeblossom

orangequat
A citrus tree, a cross between an orange and a kumquat
A citrus tree, a cross between an orange and a kumquat
The fruit from this tree

orangequats
plural of orangequat

orangeroot
The plant goldenseal (Hydrastis canadensis).

orangewood
The wood of the orange tree.

orchella
archil, orchil lichen

orchid
A plant of the orchid family (Orchidaceae), bearing unusually-shaped flowers of beautiful colours.
A light bluish-red, violet-red or purple colour.

orchidea
Synonym of orchid.

orchideas
plural of orchidea

orchidoid
Any orchid belonging to the subfamily Orchidoideae.

orchidoids
plural of orchidoid

orchilla
Orchil lichen.

oreoselin
A white crystalline substance which is obtained indirectly from the root of an umbelliferous plant, Oreoselinum majus (formerly Imperatoria oreoselinum), and yields resorcin on decomposition.

oreweed
Alternative form of oarweed.

oreweeds
plural of oreweed

orewood
Obsolete form of oarweed.

orewoods
plural of orewood

origanum
Any herbaceous plant of the genus Origanum

origanums
plural of origanum

orihou
The shrub Pseudopanax colensoi, endemic to New Zealand.

ornithochore
A plant whose spores, seeds, or fruits are dispersed by birds.

ornithochores
plural of ornithochore

ornithogalum
Any plant of the genus Ornithogalum.

ornithogalums
plural of ornithogalum

orophyte
Any plant that grows in a subalpine habitat.

orophytes
plural of orophyte

oroxylin
Any of a group of methylated flavones present in plants of the genus Oroxylum

orpin
Alternative form of orpine (“the plant or the pigment”).

orpine
Any of several temperate succulent plants of the family Crassulaceae, that have clusters of purple flowers, especially Hylotelephium telephium.
A yellow pigment of various degrees of intensity, sometimes approaching red.

orpines
plural of orpine

orthogamy
fertilization of the ovules of a plant by pollen from the same plant

orthosiphon
Any herbaceous shrub of the genus Orthosiphon.

orthosiphons
plural of orthosiphon

oshac
The perennial herb Dorema ammoniacum, whose stem yields ammoniacum.

osmundine
The roots of ferns of the genus Osmunda, used in growing orchids etc.

osoberries
plural of osoberry

osoberry
A plant of species Oemleria cerasiformis (Indian plum), a shrub native to the Pacific coast and ranges of North America.
A small, blue-black, drupe-like fruit of this plant.

osteoplast
An osteoblast.

osteoplasts
plural of osteoplast

ostryopsitrienol
A cyclic diarylheptanoid found in the plant Ostryopsis nobilis.

ostryopsitriol
A cyclic diarylheptanoid found in the plant Ostryopsis nobilis.

othalanga
The circular fruit of the suicide tree (Cerbera odollam), whose seeds contain a potent poison known as cerberin. This fruit starts of as green and becomes red as it matures.

ouabaio
A tropical African plant of species Strophanthus gratus, the source of ouabain.

ourali
Alternative form of wourali.

ourari
curare

ouricuri
A species of palm tree, Syagrus coronata, endemic to eastern Brazil.

ouricuris
plural of ouricuri

ouricury
Alternative form of ouricuri.

ourisia
Any plant of the genus Ourisia.

ourisias
plural of ourisia

outbreeder
A plant or other organism that reproduces with a distantly related or unrelated individual.

outbreeders
plural of outbreeder

overcup
The oak Quercus lyrata whose acorns are enclosed by their cups

overcups
plural of overcup

ovest
The mast and acorns of the oak; the turn-out.

ovule
The structure in a plant that develops into a seed after fertilization; the megasporangium of a seed plant with its enclosing integuments.
An immature ovum in mammals.

ovules
plural of ovule

ovulite
A fossil egg.

oxbane
A poisonous bulbous plant, Boophone toxicaria.

oxelip
Obsolete form of oxlip.

oxelips
plural of oxelip

oxeye
Several daisy-like flowers in various genera,
Several daisy-like flowers in various genera,
Several daisy-like flowers in various genera,
Any oxeye daisy.
Any oxeye daisy.
The corn camomile (Anthemis arvensis).
A titmouse, especially the great titmouse (Parus major) or the blue titmouse (Parus caeruleus).
The dunlin (Calidris alpina)
A fish of species Boops boops (bogue, box)

oxeyes
plural of oxeye

oxheart
A large heart-shaped cherry.

oxhearts
plural of oxheart

oxidocyclase
Any of a class of terpenophenol present in leaves of Rhododendron and similar plants

oxidocyclases
plural of oxidocyclase