The Collaborative International Dictionary of English v.0.48:

Tower \Tow"er\, v. i. [imp. & p. p. towered; p. pr. & vb. n.
   towering.]
   To rise and overtop other objects; to be lofty or very high;
   hence, to soar.
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         On the other side an high rock towered still.
                                                  --Spenser.
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         My lord protector's hawks do tower so well. --Shak.
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The Collaborative International Dictionary of English v.0.48:

Towered \Tow"ered\, a.
   Adorned or defended by towers.
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         Towered cities please us then.           --Milton.
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