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Results found in several dictionaries: Collins, Collaborative Dictionary
silla   sf 
1  (=asiento) seat, chair 
política de la silla vacía  policy of the empty chair, policy of not taking one's seat  (in parliament etc)  
MODISMOS calentar la silla  to stay too long, outstay one's welcome 
 silla alta high chair 
 silla de balanza, silla de hamaca  (LAm) rocking chair 
 silla de manos sedan chair 
 silla de paseo  (para bebé)  pushchair, stroller  (EEUU) 
 silla de ruedas wheelchair 
 silla de tijera folding chair 
 silla eléctrica electric chair 
 silla giratoria swivel chair 
 silla plegable folding chair
2   silla de montar saddle

Collaborative Dictionary     Spanish-English
juez de silla pref. umpire Reverso General Dictionary 
la silla de balanza nm. rocking chair Reverso General Dictionary 
la silla de hamaca nm. rocking chair Reverso General Dictionary 
la silla de montar nm. saddle Reverso General Dictionary 
la silla de paseo nm. stroller Reverso General Dictionary 
la silla de ruedas nm. wheelchair Reverso General Dictionary 
la política de la silla vacía nm. policy of the empty chair Reverso General Dictionary 
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'silla' also found in translations in English-Spanish dictionary
howdah n. la silla de elefante Reverso General Dictionary 
bath chair n. la silla de ruedas Reverso General Dictionary 
post chaise n. la silla de posta Reverso General Dictionary 
rickety chair n. la silla coja Reverso General Dictionary 

"Collins Spanish Dictionary 8th edition published in 2005 © William Collins Sons & Co Ltd 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005"