WORDS BY FIRST LETTER AND LENGTH

21 Letter Words Starting With O

Explore 33 English words that start with O and contain exactly 21 letters. Common examples include osseomusculocutaneous, overcommercialisation, octafluorocyclobutane, octamethyltrisiloxane, oligodendrogliopathic.

Browse Other O Word Lengths

21-Letter O Words by Ending Letter

All 33 21-Letter Words Starting With O

octafluorocyclobutaneThe organofluorine compound C₄F₈, related to cyclobutane by replacement of all C–H bonds with C–F bonds, and used as a deposition gas and etchant in semiconductor manufacture.octamethyltrisiloxane(chemistry) A particular linear siloxane.oligodendrogliopathic(pathology) Relating to the pathology of oligodendrogliomasoligodesoxynucleotideAlternative form of oligodeoxynucleotide.oligofructosaccharideAlternative form of oligofructose.oligoteratozoospermia(medicine) A combination of oligozoospermia and teratozoospermia.ontoepistemologicallyIn terms of ontoepistemology.ophiocordycipitaceous(mycology, relational) Of or relating to the Ophiocordycipitaceae.ophthalmodynamometricRelating to ophthalmodynamometry.ophthalmopathological(pathology) Relating to ophthalmopathologyoptoelectromechanicaloptoelectric and electromechanicalorganoautotrophicallyIn an organoautotrophic mannerorganodifferentiation(biology) The differentiation of organs in a developing plant or animaloropharyngoesophageal(medicine) Of or relating to the mouth, the pharynx and the esophagus.orthophotographicallyIn terms of, or by means of, orthophotography.osseomusculocutaneousRelating to the bones, muscles, and skin.osteoarchaeologicallyIn an osteoarchaeological mannerosteochondrodysplasia(genetics) A group of genetic disorders affecting the development and growth of bone and cartilage, leading to abnormal skeletal formation and growth abnormalities.osteochondrodysplasicRelating to osteochondrodysplasia.osteochondroprecursorAn osteochondral precursorosteorhabdomyosarcoma(pathology) A rhabdomyosarcoma that also affects boneotorhinolaryngologist(medicine) A doctor specializing in otorhinolaryngology, the study of the ear, nose, and throat.ovariohysterectomizedThat has been subjected to ovariohysterectomy.overbureaucratization(politics) Excessive bureaucratization.overcollateralizationThe act or process of overcollateralizing.overcommercialisationAlternative form of overcommercialization.overcommercializationExcessive commercialization.overconscientiousness(rare) The state of being overconscientious.overcontextualizationThe result or process of overcontextualizing.overimmunosuppressionexcessive immunosuppressionoverindustrializationExcessive industrialization.ovolactovegetarianismThe practice of being ovolactovegetarian.oxyiminocephalosporinAn oxyimino derivative of a cephalosporin

Use These Words

Open any word for its full definition, examples, synonyms, antonyms, and related vocabulary. Every item is an existing dictionary entry; phrases, hyphenated terms, and malformed headwords are excluded.