Lewis & Short

1. căchinno, āvi, ātum, 1, v. n. [like καχάζω or καγχάζω; Sanscr. kakk; and our titter, onomatop.], to laugh aloud, laugh immoderately.

  1. I. Lit. (class. but rare): famulae furtim cachinnant, Lucr. 4, 1176; 1, 919; 2, 976: ridere convivae; cachinnare ipse Apronius, Cic. Verr. 2, 3, 25, § 62; Suet. Vesp. 5; Aur. Vict. Epit. 28.
    With the acc. of that which one laughs at: exitum meum cachinnant, App. M. 3, p. 132, 25.
  2. * II. Poet. (v. Liddell and Scott under καχλάζω, γέλως, γέλασμα, and Blomfield. Aesch. Prom. 90) of the sea, to plash, ripple, roar: suavisona echo crepitu clangente cachinnat, Att. ap. Non. p. 463, 16 (Trag. Rel. v. 572 Rib.).