from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. One who, or that which, distinguishes.
from the GNU version of the Collaborative International Dictionary of English
- n. One who, or that which, distinguishes or separates one thing from another by marks of diversity.
- n. One who discerns accurately the difference of things; a nice or judicious observer.
from The Century Dictionary and Cyclopedia
- n. One who or that which distinguishes, or separates one thing from another by indicating or observing differences.
distinguish + -er (Wiktionary)