The area of the Solar System that comprises certain objects that are relatively close to the Sun, including Mercury, Venus, Earth and Mars, while not including the other planets.

(embryology) A mass of cells within a primordial embryo that will eventually develop into the distinct form of a fetus in most eutherian mammals.

(mathematics) A vector space which is additionally equipped with an inner product.

(inorganic chemistry) A complex, typically of a transition element, in which the hybridization of the central metal atom utilizes d orbitals from the shell inside that of the outermost occupied shell

(astronomy) A doughnut-shaped region of the Oort cloud located 2,000 to 20,000 AU from the sun. It is home to many minor planets, notably sednoids.

plural of inner product space

plural of inner Oort Cloud

plural of inner orbital complex

plural of inner cell mass

(software engineering) An antipattern in which a system is made so customizable as to become a (poor) replica of the development platform used to create it.