1. Having the wind against the forward side of the sails
   "the ship came up into the wind with all yards aback"
    
2. By surprise
   "taken aback by the caustic remarks"

Encyclopedia: Aback

• genus Sardinops
• genus Sargassum
• genus Sarracenia
• genus Sassafras
• genus Satureia
• genus Satureja
• genus Saturnia
• genus Sauromalus
• genus Saurosuchus
• genus Saururus
• genus Saussurea
• genus Saxegothea
• genus Saxicola
• genus Saxifraga
• genus Sayornis
• genus Scabiosa
• genus Scaphiopus
• genus Scaphosepalum
• genus Scarabaeus
• genus Scardinius
• genus Scartella
• genus Sceliphron
• genus Sceloglaux
• genus Sceloporus
• genus Schaffneria