the number that is represented as a one followed by 12 zeros
one million million million
Noun
the number that is represented as a one followed by 18 zeros
octillion
Noun
the number that is represented as a one followed by 27 zeros
output-to-input ratio
Noun
the output power of a transducer divided by the input power
orthogonal opposition
Noun
the relation of opposition between things at right angles
optative mood
Noun
a mood (as in Greek or Sanskrit) that expresses a wish or hope
occupancy rate
Noun
the percentage of all rental units (as in hotels) are occupied or rented at a given time
ordered series
Noun
an ordered reference standard
obtuse angle
Noun
an angle between 90 and 180 degrees
oblique angle
Noun
an angle that is not a right angle or a multiple of a right angle
oppositeness
Noun
the relation between opposed entities
oblique triangle
Noun
a triangle that contains no right angle
obtuse triangle
Noun
a triangle that contains an obtuse interior angle
obtuse-angled triangle
Noun
a triangle that contains an obtuse interior angle
octagon
Noun
an eight-sided polygon
orbital plane
Noun
(astronomy) the plane on which a body is orbiting
outer boundary
Noun
the outside boundary or surface of something
omnipresence
Noun
the state of being everywhere at once (or seeming to be everywhere at once)
octahedron
Noun
any polyhedron having eight plane faces
over-crowding
Noun
excessive crowding
open marriage
Noun
a marriage in which each partner is free to enter into extraneous sexual relationships without guilt or jealousy from the other
oestrus
Noun
applies to nonhuman mammals: a state or period of heightened sexual arousal and activity
orthodox sleep
Noun
a recurring sleep state during which rapid eye movements do not occur and dreaming does not occur
oxygen debt
Noun
a cumulative deficit of oxygen resulting from intense exercise
olfactory impairment
Noun
a disorder in the sense of smell
osteodystrophy
Noun
defective bone development
ovarian pregnancy
Noun
ectopic pregnancy in the ovary
overbite
Noun
(dentistry) malocclusion in which the upper teeth extend abnormally far over the lower teeth
organic disorder
Noun
disorder caused by a detectable physiological or structural change in an organ
obstructive shock
Noun
shock caused by obstruction of blood flow
occupational disease
Noun
disease or disability resulting from conditions of employment (usually from long exposure to a noxious substance or from continuous repetition of certain acts)
onycholysis
Noun
separation of a nail from its normal attachment to the nail bed
onychosis
Noun
any disease or disorder of the nails
osteitis deformans
Noun
a disease of bone occurring in the middle aged and elderly
orthostatic hypotension
Noun
low blood pressure occurring in some people when they stand up
orthochorea
Noun
a form of chorea in which spasms occur mainly when the patient is erect
osteosclerosis congenita
Noun
an inherited skeletal disorder beginning before birth
ornithosis
Noun
an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds
oral herpes
Noun
caused by herpes simplex virus type 1 (HSV-1)
osteoarthritis
Noun
chronic breakdown of cartilage in the joints
opportunistic infection
Noun
any infection caused by a microorganism that does not normally cause disease in humans
osteosclerosis
Noun
abnormal hardening or eburnation of bone
osteogenesis imperfecta
Noun
autosomal dominant disorder of connective tissue characterized by brittle bones that fracture easily
oriental sore
Noun
leishmaniasis of the skin
oligodactyly
Noun
congenital condition in which some fingers or toes are missing
oligodontia
Noun
congenital condition in which some of the teeth are missing
otosclerosis
Noun
hereditary disorder in which ossification of the labyrinth of the inner ear causes tinnitus and eventual deafness
oculopharyngeal muscular dystrophy
Noun
a form of muscular dystrophy that usually begins between early adulthood and middle age and first affects muscles of the eyelid and throat
oxycephaly
Noun
a congenital abnormality of the skull
oak blight
Noun
a black plant louse that lives on oaks and dogwoods