American Heritage Dictionary
(2)
Century Dictionary
(7)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
And as we speak now, these nautilus are tracking out their behaviors to us.— Peter Ward on mass extinctions
Near Shekar town we had lunch in a roadside restaurant, where we bought a well-preserved fossil nautilus from a Tibetan boy there.— TravelPod.com Recent Updates
This can be used as a nautilus-script or a nautilus-action.— GNOME-Look.org Content
Ubuntu users can install the nautilus-gksu, nautilus-image-converter, and nautilus-open-terminal packages for starters; users of other distributions should search their package manager for "nautilus" (or "konqueror" for KDE-based systems) to see what's available for quick right-click fix-ups.— Daily DIY

American Heritage Dictionary (1)
Century Dictionary (1)
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 a few times a year.