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c.1500, "star-spangled," from Latin stellatus "covered with stars," past participle of stellare "to set with stars," from stella (see star (n.)). Meaning "star-shaped" is recorded from 1660s.
stellate stel·late (stěl'āt') or stel·lat·ed (-ā'tĭd)adj. Arranged or shaped like a star; radiating from a center.