snicker

A glandered horse.

to snicker

or to snigger

To laugh privately, or in one's sleeve.

Snicker
·noun A half suppressed, broken laugh. II. Snicker ·vi To laugh slyly; to laugh in one's sleeve. I...

Webster's Dictionary of the English Language
to snicker
To laugh slily, wantonly, or contemptuously; to laugh in one's sleeve.--Johnson. Then I heard the g...

Dictionary of American Words And Phrases by John Russell Bartlett.