ooblastic
Relating to the ooblast.

oocystic
Relating to an oocyst.

oocytelike
Resembling or characteristic of an oocyte.

oocytic
Relating to or composed of oocytes.

oodiaulic
Having two reproductive duct systems, a hermaphroditic one for copulation and one for depositing eggs.

ooecial
Relating to the ooecium.

oofy
Having lots of oof (money); rich, wealthy.

oogamous
Of or relating to oogamy

oogenetic
Of or pertaining to oogenesis.

oogenic
That produces oocytes

oogonial
of or pertaining to an oogonium

ooid
A small calcium carbonate or iron coated grain found on the seafloor.

ooidal
Egg-shaped.
Oolitic.

ooids
plural of ooid

ookinetic
Tending to produce the female element.

oolithic
Relating to ooliths.

oolitic
Made up of, or containing oolites
Of a prehistoric era; Jurassic.

oolitics
plural of oolitic

oologic
Relating to oology

oological
oologic

oomphier
comparative form of oomphy: more oomphy

oomphiest
superlative form of oomphy: most oomphy

oomphless
Lacking oomph (vitality or sex appeal).

oomphy
Full of oomph (strength, power, passion or effectiveness).
Full of oomph (sex appeal).

oomyceteous
Alternative form of oomycetous.

oomyceticidal
That kills oomycetes

oomycetous
Relating to, or characteristic of oomycetes

ooo
hugs (usually placed at the end of a letter or in text messaging, sometimes alongside xxx meaning kisses)

oop
Alternative form of oops.

oophagic
Synonym of oophagous.

oophagous
Relating to, or exhibiting oophagy

oophoric
Having the nature of, or belonging to, an oophore.

oophorous
Containing eggs or ova.

oophytic
of, pertaining to or characteristic of an oophyte

ooplasmatic
Alternative form of ooplasmic.

ooplasmic
Concerning the cytoplasm of eggs

oorie
Alternative form of ourie.

oosporic
Relating to the oospore.

oosporiferous
Bearing oospores.

oostatic
Relating to, or causing oostasis

ootaxonomic
Relating to ootaxonomy

oothecal
Relating to an ootheca.

oozey
Alternative form of oozy.

oozier
comparative form of oozy: more oozy

ooziest
superlative form of oozy: most oozy

oozooids
plural of oozooid

oozy
Of or pertaining to the quality of something that oozes.

opacifiable
Capable of being made opaque.

opaled
opalescent; misty or milky in appearance

opalescent
Exhibiting a milky iridescence like that of an opal.

opalesque
Similar to opal; having some of the qualities of opal.

opalic
Having a structure similar to that of opal

opaline
Resembling opal in having a milky white iridescence.

opalish
Resembling or characteristic of opal.

opalled
Alternative form of opaled.

openable
Capable of being opened.

opencast
Of or pertaining to strip mining, in which material is removed from a surface that has been exposed

openhearted
Alternative form of open-hearted.

openminded
Alternative spelling of open-minded.

openmouthed
Alternative form of open-mouthed.

opensource
Alternative spelling of open-source.

opephoroid
Relating to or characteristic of diatoms of the genus Opephora.

operable
Able to be operated or used.
Able to be put into operation; practicable.
Able to be treated by surgery.

operadic
Of or pertaining to operads.

operagoing
Attending opera performances.

operalike
Resembling or characteristic of opera.

operant
That operates to produce an effect.

operants
plural of operant

operatable
Alternative form of operable.

operatic
Of, related to, or typical of opera.

operatical
Alternative form of operatic.

operational
Of or relating to operations, especially military operations.
Functioning and ready for use.
Effective or operative.
Determined by means of practical measures.

operationalisable
Alternative spelling of operationalizable.

operationalistic
Of or pertaining to operationalism.

operationalizable
Possible to operationalize; subject to operationalization.

operationistic
Of or relating to operationism.

operative
Effectual or important.
Functional, in working order.
Having the power of acting; hence, exerting force, physical or moral; active in the production of effects.
Producing the appropriate or designed effect; efficacious.
Based upon, or consisting of, a surgical operation or operations.

operatives
plural of operative

operatorial
Of or pertaining to an operator

operatorless
Without an operator (person who operates); fully automatic.

opercled
Having an opercle.

opercular
relating to the operculum

operculars
plural of opercular

operculate
Having an operculum.

operculated
operculate

operculiferous
Bearing an operculum.

operculiform
Having the form of a lid or cover.

operculigenous
Producing an operculum.

operculigerous
Having an operculum.

operculoinsular
opercular and insular

operculopremotor
opercular and premotor

operettic
of or relating to an operetta

operonic
Relating to operons

operose
Of a person: busy, industrious, or painstaking.
Made with or requiring a lot of labour; painstaking, laborious.
Tedious, wearisome.

ophelic
Of or pertaining to felworts, of a former plant genus, Ophelia (now included in Swertia), of the gentian family.

ophic
Relating to snakes.

ophicephalous
snake-headed

ophidic
Relating to the Ophidia: the snakes and related reptiles.

ophidiophobic
relating to ophidiophobia; having fear of snakes

ophiocephalous
ophicephalous

ophiocordycipitaceous
Of or relating to the Ophiocordycipitaceae.

ophioglossaceous
Belonging to the family Ophioglossaceae of ferns.

ophioid
Snakelike.

ophiolatrous
snake-worshipping

ophiolithic
Misspelling of ophiolitic.

ophiolitic
Of or pertaining to sections of the oceanic crust and the subjacent upper mantle that have been uplifted or emplaced to be exposed within continental crustal rocks

ophioliticlastic
Being a clastic rock chiefly composed of ophiolitic materials.

ophiolitiferous
Bearing ophiolite.

ophiological
Of or relating to ophiology.

ophiomorphic
snake-shaped; serpentine

ophiophagous
Feeding on snakes.

ophiophobic
Afraid of snakes.

ophiostomataceous
Belonging to the family Ophiostomataceae.

ophiostomatalean
Relating to fungi of the order Ophiostomatales

ophiostomatoid
Synonym of ophiostomatalean.

ophite
Any of various rocks having snake-like markings, such as a mottled greenish porphyry.

ophitic
Having crystals of feldspar interspersed with plates of augite.

ophiuran
Of or relating to the Ophiuroidea.

ophrynopine
Relating to sawflies of the genus Ophrynopus

ophthal
Ophthalmology.
Ophthalmologist.

ophthalmalgic
Relating to ophthalmalgia.

ophthalmascopic
Misspelling of ophthalmoscopic.

ophthalmic
Of or pertaining to the eyes.
Visionary, looking to the future.

ophthalmodynamometric
Relating to ophthalmodynamometry.

ophthalmologic
ophthalmological

ophthalmological
Pertaining to ophthalmology.

ophthalmometric
Relating to ophthalmometry.

ophthalmoparetic
Of or relating to ophthalmoparesis.

ophthalmopathic
Relating to eye disease.

ophthalmopathological
Relating to ophthalmopathology

ophthalmoplegic
Relating to, or exhibiting, ophthalmoplegia.

ophthalmoscopic
Of, pertaining to or using an ophthalmoscope.

ophthalmoscopical
Synonym of ophthalmoscopic.

ophthalmotemporal
Relating to the eye and the temple

opiatelike
Resembling or characteristic of an opiate.

opiatergic
Alternative form of opioidergic.

opiatic
Of or relating to opiates.

opiferous
Bringing help; helpful.

opiliaceous
Of or relating to the Opiliaceae.

opinable
Capable of being opined or thought.

opinionable
Being a matter of opinion; not positively settled.

opinional
Based on or constituting an opinion.

opinionative
Of, pertaining to, being, or expressing opinion.
Opinionated.

opinioned
simple past and past participle of opinion

opinionless
Without an opinion or opinions.

opioidergic
Operating on the opioid system in the body or brain.

opioidlike
Resembling or characteristic of opioids.

opiophobic
Of, relating to, or affected by opiophobia—the aversion to prescribing or administering opiates for analgesia.