Definitions from Wiktionary (SY)

▸ noun:  A Chinese Filipino surname from Spanish [in turn from Hokkien]
▸ noun:  (astronomy) Abbreviation of Seyfert galaxy., a type of AGN class of active galaxy. [(astronomy) A kind of galaxy having quasar-like nuclei.]
▸ noun:  Alternative form of Si [A diminutive of the male given name Simon.]
▸ noun:  Initialism of steam yacht: a steam-powered yacht [A class of luxury or commercial yacht with primary or secondary steam propulsion in addition to the sails usually carried by yachts.]
▸ noun:  Initialism of sailing yacht: a wind-powered yacht [A leisure craft that uses sails as its primary means of propulsion.]
▸ noun:  Initialism of school year. [(education) The academic year of a school.]

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