Webster’s Revised Unabridged Dictionary · 1913
Snicker
Snick′er (snĭk′ẽr), v. i. [imp. & p. p. Snickered; p. pr. & vb. n. Snickering.] [Cf. D. snikken to sob, to sigh.] [Written also snigger.] 1. To laugh slyly; to laugh in one's sleeve.
2. To laugh with audible catches of voice, as when persons attempt to suppress loud laughter.
Snick′er, n. A half suppressed, broken laugh. [Written also snigger.]