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{adj: acute} of an angle; less than 90 degrees
<-> obtuse

{adj: advanced, ripe} far along in time
"a man of advanced age"
"advanced in years"
"a ripe old age"
"the ripe age of 90"

{adj: amphitropous} (of a plant ovule) partly inverted; turned back 90 degrees on its stalk
<-> anatropous

{adj: ninety, 90, xc} being ten more than eighty

{adj: nonagenarian} being from 90 to 99 years old
"the nonagenarian inhabitants of the nursing home"

{adj: obtuse} of an angle; between 90 and 180 degrees
<-> acute

{adj: reflexed} (of leaves) bent downward and outward more than 90 degrees

{n: Appleton layer, F layer, F region} the highest region of the ionosphere (from 90 to 600 miles up) which contains the highest concentration of free electrons and is most useful for long-range radio transmission

{n: Heaviside layer, Kennelly-Heaviside layer, E layer, E region} a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length

{n: Seychelles, Seychelles islands} a group of about 90 islands in the western Indian Ocean north of Madagascar

{n: acute angle} an angle less than 90 degrees but more than 0 degrees

{n: amphitropous ovule} a partly inverted ovule turned back 90 degrees on its stalk

{n: ball} round object that is hit or thrown or kicked in games
"the ball travelled 90 mph on his serve"
"the mayor threw out the first ball"
"the ball rolled into the corner pocket"

{n: bevel, cant, chamfer} two surfaces meeting at an angle different from 90 degrees

{n: container ship, containership, container vessel} a cargo ship designed to hold containerized cargoes
"the weight of the documentation of all the consignments on board a contemporary container ship can exceed 90 pounds"

{n: dark matter} (cosmology) a hypothetical form of matter that is believed to make up 90 percent of the matter in the universe; it is invisible (does not absorb or emit light) and does not collide with atomic particles but exerts gravitational force

{n: east, due east, eastward, E} the cardinal compass point that is at 90 degrees

{n: eighties, mid-eighties} the time of life between 80 and 90

{n: gale} a strong wind moving 45-90 knots; force 7 to 10 on Beaufort scale

{n: gasohol} a gasoline substitute consisting of 90% gasoline and 10% grain alcohol from corn

{n: high blood pressure, hypertension} a common disorder in which blood pressure remains abnormally high (a reading of 140/90 mm Hg or greater)
<-> hypotension

{n: hydrogen cyanide} a highly poisonous gas or volatile liquid that smells like bitter almonds; becomes a gas at around 90 degree Fahrenheit and is most dangerous when inhaled; the anhydride of hydrocyanic acid; used in manufacturing

{n: miter joint, mitre joint, miter, mitre} joint that forms a corner; usually both sides are bevelled at a 45-degree angle to form a 90-degree corner

{n: nineties, mid-nineties} the time of life between 90 and 100

{n: ninetieth} position 90 in a countable series of things

{n: ninety, 90, XC} the cardinal number that is the product of ten and nine

{n: obtuse angle} an angle between 90 and 180 degrees

{n: right angle} the 90 degree angle between two perpendicular lines
<-> oblique angle

{n: strontium 90} a radioactive isotope of strontium (with the mass number 90) that is present in the fallout from nuclear explosions; can be assimilated like calcium into bones

{n: thorium, Th, atomic number 90} a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands

{v: recover, go back, recuperate} regain a former condition after a financial loss
"We expect the stocks to recover to $2.90"
"The company managed to recuperate"

{v: turn out, splay, spread out, rotate} turn outward
"These birds can splay out their toes"
"ballet dancers can rotate their legs out by 90 degrees"

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