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We present and discuss initial selection criteria and first results in M33from a systematic search for extragalactic symbiotic stars. We show that thepresence of diffuse interstellar gas emission can significantly contaminate thespectra of symbiotic star candidates. This important effect forces upon us amore stringent working definition of an extragalactic symbiotic star. We reportthe first detections and spectroscopic characterisation of 12 symbioticbinaries in M33. We found that four of our systems contain carbon-rich giants.In another two of them the giant seems to be a Zr-enhanced MS star, while theremaining six objects host M-type giants. The high number ratio of C to Mgiants in these binaries is consistent with the low metallicity of M33. Thespatial and radial velocity distributions of these new symbiotic binaries areconsistent with a wide range of progenitor star ages.

A Survey of the Local Group of Galaxies for Symbiotic Binary Stars. I. First detection of symbiotic stars in M33