What is the Latin word for dreamer?

The usual Latin words for “dreamer” are somniō, dormītō, veternōsus. The right choice depends on the sense; see the distinctions below.

English → Latin

“dreamer” in Latin

somniōto dream; to daydream, think idly; to talk idly dormītōto slumber; to feel sleepy, drowsy; to do nothing veternōsuslethargic; sleepy, drowsy, dreamy; languid, spiritless

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

dreamer

One that dreams, somnians (PROP.): dormitator (figuratively, one that is or acts as if he were asleep; Plaut., Trin., 4, 2, 20 and 142).

A fanciful man; a visionary [Vid: ENTHUSIAST].

An idler, homo somniculosus or veternosus (a sleepy fellow, a sluggard): dormitator (Plaut.).

Quick answer

What is the Latin word for dreamer?: The usual Latin words for “dreamer” are somniō, dormītō, veternōsus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.