a large-sized, mild, succulent onion, often eaten raw.
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How to use Spanish onion in a sentence
His attention is arrested by the conspicuous heading, "Spanish onion Seeds."Ten Years Among the Mail Bags | James Holbrook
British Dictionary definitions for Spanish onion
any of several varieties of large mild-flavoured onions
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012