Denshi Jisho — Online Japanese dictionary

堂 どう 1: temple; shrine; hall;
2: prefix to building meaning "magnificent"
Common word, Noun, Noun suffix, Noun prefix 
堂宇 どうう edifice; temple; hall
Noun 
堂々 どうどう 1: magnificent; grand; impressive; dignified; majestic; imposing; stately;
2: fair; square; open;
3: (Adverb taking the 'to' particle) grandly; boldly; confidently;
4: fairly; squarely;
5: unreservedly; without apology; without hesitation
Common word, Taru-adjective, Adverb taking the 'to' particle 
堂舎 とうじゃ large and small buildings, esp. shrines and temples
Noun, Archaism 
堂奥 どうおう secret knowledge; interior of a temple
Noun 
堂舎 どうしゃ large and small buildings, esp. shrines and temples
Noun, Archaism 
堂舎 どうじゃ large and small buildings, esp. shrines and temples
Noun, Archaism 
堂塔 どうとう temple; temple buildings
Noun 
堂堂 どうどう 1: magnificent; grand; impressive; dignified; majestic; imposing; stately;
2: fair; square; open;
3: (Adverb taking the 'to' particle) grandly; boldly; confidently;
4: fairly; squarely;
5: unreservedly; without apology; without hesitation
Taru-adjective, Adverb taking the 'to' particle 
堂守 どうもり temple keeper
Noun 
堂上 どうじょう on the roof; court nobles
Noun 
堂にいる どうにいる to become an expert; to be master at
Expression, Godan verb with ru ending 
堂に入る どうにいる to become an expert; to be master at
Expression, Godan verb with ru ending 
堂々回り どうどうめぐり going around in circles; circling a temple; roll-call vote
Noun, Suru verb 
堂々巡り どうどうめぐり going around in circles; circling a temple; roll-call vote
Noun, Suru verb 
堂堂回り どうどうめぐり going around in circles; circling a temple; roll-call vote
Noun, Suru verb 
堂堂巡り どうどうめぐり going around in circles; circling a temple; roll-call vote
Noun, Suru verb 

You can also

Look up kanji details for 堂.

Try a Yahoo Jisho search for 堂 .
Try a Goo Jisho search for 堂 .
Try a Google search for 堂 .