15-letter words containing si
- onychocryptosis — a form of nail disease in which nails are ingrown
- open admissions — a policy of admitting applicants to an institution, especially a university, regardless of previous academic record or grades.
- open university — higher education by correspondence
- opposite number — counterpart; equivalent: New members with an interest in folk art will find their opposite numbers in the association's directory.
- opposite prompt — the offstage area to the right as one faces the audience. Abbreviation: O.P.
- opposition hold — a particular way of holding rock in mountain-climbing
- oppositionality — Quality of being oppositional.
- organomagnesium — pertaining to or noting an organic compound, especially an organic halide, containing magnesium linked to carbon.
- osteochondrosis — a disease of bone and cartilage growth centers in children that begins as a necrosis and is followed by regeneration or renewed calcification.
- out of business — If a shop or company goes out of business or is put out of business, it has to stop trading because it is not making enough money.
- out of sight of — not in sight
- outside caliper — a caliper whose legs turn inward so that it can measure outside dimensions, as the diameter of a rod.
- outside forward — one of two attacking players who usually play on the far side of the field; wing.
- outside the box — a container, case, or receptacle, usually rectangular, of wood, metal, cardboard, etc., and often with a lid or removable cover.
- oval of cassini — the locus of a point such that the product of the distances from the point to two fixed points is constant.
- over-aggressive — characterized by or tending toward unprovoked offensives, attacks, invasions, or the like; militantly forward or menacing: aggressive acts against a neighboring country.
- over-enthusiasm — absorbing or controlling possession of the mind by any interest or pursuit; lively interest: He shows marked enthusiasm for his studies.
- over-expressive — full of expression; meaningful: an expressive shrug.
- over-passionate — having, compelled by, or ruled by intense emotion or strong feeling; fervid: a passionate advocate of socialism.
- overemphasizing — Present participle of overemphasize.
- overpessimistic — excessively pessimistic or negative in outlook
- oversensitivity — excessively or unduly sensitive.
- packing density — a measure of the amount of data that can be held by unit length of a storage medium, such as magnetic tape
- paleogeophysics — (used with a plural verb) inferred geophysical conditions or processes of designated periods of the geologic past.
- panoramic sight — an artillery sight that can be rotated horizontally in a full circle.
- panzer division — an armored division of the German army, especially in World War II, consisting chiefly of tanks and organized for making rapid attacks.
- parallel cousin — a cousin who is the child either of one's mother's sister or of one's father's brother.
- parasiticalness — the condition or characteristic of being parasitic
- parthenogenesis — development of an egg without fertilization.
- passifloraceous — of, relating to, or belonging to the Passifloraceae, a tropical and subtropical family of climbing plants including the passionflowers: the flowers have five petals and threadlike parts forming a dense mass (corona) around the central disc
- passive smoking — the inhaling of cigarette, cigar, and pipe smoke of others, especially by a nonsmoker in an enclosed area.
- pathophysiology — the physiology of abnormal or diseased organisms or their parts; the functional changes associated with a disease or syndrome.
- peace offensive — an active program, policy, propaganda campaign, etc., by a national government for the purpose of terminating a war or period of hostility, lessening international tensions, or promoting peaceful cooperation with other nations.
- pematangsiantar — a city on NE Sumatra, in Indonesia.
- percussion lock — a gunlock on a firearm that fires by striking a percussion cap.
- percussion tool — a power driven tool which operates by striking rapid blows: the power may be electricity or compressed air
- pessimistically — pertaining to or characterized by pessimism or the tendency to expect only bad outcomes; gloomy; joyless; unhopeful: His pessimistic outlook kept him from applying for jobs for which he was perfectly qualified.
- phlebosclerosis — sclerosis, or hardening, of the walls of veins.
- phloem necrosis — a disease of the American elm caused by a mycoplasmalike organism, characterized by yellowing and necrosis of the foliage and yellowish-brown discoloration of the phloem.
- photo-secession — an association of photographers founded in New York City in 1902 by Alfred Stieglitz and Edward Steichen that advocated the development and public recognition of photography as a fine art.
- photosensitizer — a drug, food, or other chemical that increases sensitivity to light and other visible photons
- photosynthesize — to produce carbohydrates by photosynthesis: Plants with light green leaves don't photosynthesize as well as those with darker leaves.
- phototransistor — a transistor that amplifies current induced by photoconductivity.
- physical change — a usually reversible change in the physical properties of a substance, as size or shape: Freezing a liquid is a physical change.
- physical memory — (memory management) The memory hardware (normally RAM) installed in a computer. The term is only used in contrast to virtual memory.
- physical optics — the branch of optics concerned with the wave properties of light, the superposition of waves, the deviation of light from its rectilinear propagation in a manner other than that considered by geometrical optics, the interaction of light with matter, and the quantum, corpuscular aspects of light.
- physicalization — to express in physical terms; give form or shape to: The dancers physicalized the mood of the music.
- physicochemical — physical and chemical: the physicochemical properties of an isomer.
- physiologically — of or relating to physiology.
- physiopathology — pathophysiology.