11-letter words starting with o
- observables — Plural form of observable.
- observances — Plural form of observance.
- observantly — quick to notice or perceive; alert.
- observation — an act or instance of noticing or perceiving.
- observative — Observant; watchful.
- observatory — a place or building equipped and used for making observations of astronomical, meteorological, or other natural phenomena, especially a place equipped with a powerful telescope for observing the planets and stars.
- observingly — Attentively, observantly.
- obsessional — the domination of one's thoughts or feelings by a persistent idea, image, desire, etc.
- obsessively — In an obsessive manner.
- obsignation — the action or process of certifying by means of, or as if with, a seal or a mark of ratification
- obsignatory — (obsolete) Ratifying; confirming by sealing.
- obsolescent — becoming obsolete; passing out of use, as a word: an obsolescent term.
- obsolescing — to be or become obsolescent.
- obstetrical — of or relating to the care and treatment of women in childbirth and during the period before and after delivery.
- obstinately — firmly or stubbornly adhering to one's purpose, opinion, etc.; not yielding to argument, persuasion, or entreaty.
- obstipation — obstinate constipation.
- obstriction — the condition of being under an obligation, or a duty or compulsion that causes obligation
- obstructing — Present participle of obstruct.
- obstruction — something that obstructs, blocks, or closes up with an obstacle or obstacles; obstacle or hindrance: obstructions to navigation.
- obstructive — to block or close up with an obstacle; make difficult to pass: Debris obstructed the road.
- obtemperate — (obsolete) To obey.
- obtestation — The act of obtesting; supplication; protestation.
- obtrusively — having or showing a disposition to obtrude, as by imposing oneself or one's opinions on others.
- obumbration — the action of making dim, dark, obfuscated, or eclipsed
- obviousness — The characteristic of being obvious.
- occasioning — Present participle of occasion.
- occidentals — Plural form of occidental.
- occipitalis — A muscle of the head, sometimes considered to be part of the occipitofrontal muscle.
- occipitally — from an occipital point of view
- occultation — Astronomy. the passage of one celestial body in front of another, thus hiding the other from view: applied especially to the moon's coming between an observer and a star or planet.
- occupancies — Plural form of occupancy.
- occupations — Plural form of occupation.
- occurrences — the action, fact, or instance of occurring.
- ocean liner — an oceangoing passenger ship, operating either as one unit of a regular scheduled service or as a cruise ship.
- ocean perch — redfish (def 1).
- ocean-going — (of a ship) designed and equipped to travel on the open sea.
- oceanariums — Plural form of oceanarium.
- oceanfronts — Plural form of oceanfront.
- oceanologic — of or relating to the ocean and its study.
- ochlocratic — Pertaining to ochlocracy.
- ochlophobia — an abnormal fear of crowds.
- ochlophobic — relating to or suffering from ochlophobia
- octachordal — having or consisting of eight notes or eight strings
- octagonally — In an octagonal manner.
- octahedrite — anatase.
- octahedrons — Plural form of octahedron.
- octahydrate — (chemistry) A hydrate whose solid contains eight molecules of water of crystallization per molecule, or per unit cell.
- octal forty — (jargon) Jargon for "I'm drawing a blank.", I can't work it out.
- octandrious — having eight stamens.
- octanedioic — designating a type of acid found in suberin and castor oil