American Heritage Dictionary
Century Dictionary
(2)
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
So even though Jacob tugs at my heartstrings, and I wish I could have Edward to myself (lol) Edward and Bella are right together.— Entertainment Weekly's PopWatch
 (The line where Ti tells Miss Yuen that he's putting his Dickie in her hands also made me laugh even as I felt bad for doing so …)  When it comes time to tug at your heartstrings, the movie does so in an entirely predictable manner … but still manages to moisten the eyes thanks in large part to Xu's performance.— Fat Guys at the Movies
"It pulled at so many moms 'heartstrings, the bond that we have between us," Phelps said.— Latest News
Wishing to pluck on your nostalgic heartstrings, the Playback Pack from Proporta is now available for the Apple 2G iPod classic (80GB and 120GB) Made from a super tough polycarbonate to protect your iPod classic ...— Megite Technology News: What's Happening Right Now

If you'd like to prod us on getting a pronunciation for this word, sign in (or sign up) and let us know.
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word several times a year.