oophorectomy
— Noun
– English
～ surgical removal of one of both ovaries
oophoritis
— Noun
– English
～ inflammation of one or both ovaries
oophorosalpingectomy
— Noun
– English
～ surgical removal of one or both ovaries and the corresponding Fallopian tubes
Oort cloud
— Noun
– English
～ (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto; perturbations (as by other stars) can upset a comet's orbit and may send it tumbling toward the sun
oort
— Noun
– English
～ Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992)
oosphere
— Noun
– English
～ a gamete; used especially of lower plants
oospore
— Noun
– English
～ a thick-walled sexual spore that develops from a fertilized oosphere in some algae and fungi
ootid
— Noun
– English
～ mature ovum after penetration by sperm but before the formation of a zygote
op art
— Noun
– English
～ a style of abstractionism popular in the 1960s; produces dramatic visual effects with colors and contrasts that are difficult for the eye to resolve
opacification
— Noun
– English
～ the process of becoming cloudy or opaque
opacity
— Noun
– English
～ the quality of being opaque to a degree; the degree to which something reduces the passage of light
opacity
— Noun
– English
～ the phenomenon of not permitting the passage of electromagnetic radiation
opacity
— Noun
– English
～ incomprehensibility resulting from obscurity of meaning
opah
— Noun
– English
～ large elliptical brightly colored deep-sea fish of Atlantic and Pacific and Mediterranean
opal glass
— Noun
– English
～ a milky white translucent or opaque glass
opal
— Noun
– English
～ a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones