10-letter words starting with or
- orthoclase — a common white or pink mineral of the feldspar group, KAlSi 3 O 8 , having two good cleavages at right angles, and found in silica-rich igneous rocks: used in the manufacture of porcelain.
- orthodoxly — In a correct or proper way; conventionally; correctly. (from 17th c.).
- orthodrome — (geometry) a great circle, or part of one.
- orthodromy — a route or the navigation of a route which forms part of a large circle
- orthoepist — the study of correct pronunciation.
- orthogenic — Psychology. of, concerned with, or providing corrective treatment for mentally retarded or seriously disturbed children: orthogenic class.
- orthogonal — Mathematics. Also, orthographic. pertaining to or involving right angles or perpendiculars: an orthogonal projection. (of a system of real functions) defined so that the integral of the product of any two different functions is zero. (of a system of complex functions) defined so that the integral of the product of a function times the complex conjugate of any other function equals zero. (of two vectors) having an inner product equal to zero. (of a linear transformation) defined so that the length of a vector under the transformation equals the length of the original vector. (of a square matrix) defined so that its product with its transpose results in the identity matrix.
- orthograde — walking in an upright manner
- orthograph — An orthographic projection.
- orthometry — The art or practice of constructing verses correctly; the laws of correct poetry.
- orthopedic — of or relating to orthopedics.
- orthophoto — An aerial photograph that has been geometrically corrected (orthorectified) such that the scale of the photograph is uniform, meaning that the photo can be considered equivalent to a map.
- orthophyre — feldspar rock
- orthopneic — difficult or painful breathing except in an erect sitting or standing position.
- orthopnoea — difficult or painful breathing except in an erect sitting or standing position.
- orthopraxy — correctness or orthodoxy of action or practice.
- orthoprism — a prism which has faces parallel to its vertical axis
- orthoptera — Any of very many four-winged insects, of the order Orthoptera, such as grasshoppers, crickets and locusts.
- orthoptics — a method of exercising the eye and its muscles in order to cure strabismus or improve vision.
- orthoptist — One who practices orthoptics.
- orthorexia — (psychology) A fixation with healthy or righteous eating.
- orthorexic — Having a fixation with healthy or righteous eating.
- orthoscope — (formerly) an instrument for examining the internal structures of the eye through a layer of water that neutralizes the refraction of the cornea.
- orthostyle — (of columns) erected in a straight row.
- orthotonic — characterized by muscular rigidity
- orthotopic — (anatomy) in the normal position.
- orthotropy — the state of being either orthotropic or orthotropous
- oryctology — the study of fossils, minerals, and rocks