(chemistry) A macromolecule having a single branch point from which linear chains (or arms) emanate.

(chemistry) a polymer composed of star macromolecules

(astronomy) A star which has lost most or all of its hydrogen, leaving just a core of helium.

(astronomy) The star nearest to Earth's axis when extended above the North Pole: currently Polaris, formerly Thuban.

(astronomy) A bluish-white star in the constellation Canis Major; Alpha (α) Canis Majoris A. A vertex of the Winter Triangle and the brightest star in the night sky. It is actually a binary star with a white dwarf companion star.

(astronomy) A group of gravitationally bound stars and other material (such as nebulae and planets), conventionally with one generation of similarly aged stars from the same pre-stellar nebula.

(astronomy) any of a class of red giant stars having a high proportion of carbon because of helium burning

Any of various echinoderms, of the class Ophiuroidea, that resemble starfish and have long, slender arms that regenerate when snapped off.

Of an actor: to star as a guest. / (sports) Of a player: to play as a guest of another team.

(music) A guest on a music or other recording. / (television) An actor on a television program who stars in one, or a few, episodes.