any of a group of disorders each having symptoms that occur on a continuum and certain features that are shared along its spectrum but that manifest in markedly different forms and degrees.
See also autism spectrum disorder.
noun 1. single photon emission computed tomography: a technique for measuring brain function similar to PET. SPECT abbr. single photon emission computed tomography SPECT single photon emission computed tomography
noun, plural specula [spek-yuh-luh] /ˈspɛk yə lə/ (Show IPA), speculums. 1. a mirror or reflector, especially one of polished metal, as on a reflecting telescope. 2. speculum metal. 3. Surgery. an instrument for rendering a part accessible to observation, as by enlarging an orifice. 4. Ornithology. a lustrous or specially colored area on the wings […]
adjective 1. pertaining to or having the properties of a mirror. 2. pertaining to a speculum. 3. Optics. (of reflected light) directed, as from a smooth, polished surface (opposed to diffuse). adjective 1. of, relating to, or having the properties of a mirror: specular reflection 2. of or relating to a speculum
verb (used without object), speculated, speculating. 1. to engage in thought or reflection; meditate (often followed by on, upon, or a clause). 2. to indulge in conjectural thought. 3. to engage in any business transaction involving considerable risk or the chance of large gains, especially to buy and sell commodities, stocks, etc., in the expectation […]