Should be "lose"
https://bugzilla.gnome.org/show_bug.cgi?id=700844
* These string forms are string forms those supported by
* the CSS3 colors module, and can be parsed by gdk_rgba_parse().
*
- * Note that this string representation may loose some
+ * Note that this string representation may lose some
* precision, since r, g and b are represented as 8-bit
* integers. If this is a concern, you should use a
* different representation.