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“hobby, hobby-horse” in Latin

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

hobby, hobby-horse
PROPR., arundo. To ride a hobby-horse, equitare in arundine longa, (Hor.).
IMPROPR., A man’s hobby, studium alicujus (his favorite pursuit): morbus et insania alicujus (if he pursues it recklessly, etc.; both of Verres’s passion for plate, ornamental furniture, etc.; venio nunc ad istius, quemadmodum ipse appellat, studium, ut amici ejus, morbum et insaniam, Cic., 4 Verr., init.). Every man has his hobby, trahit sua quemque voluptas (Verg.); sua cuique sponsa, mihi mea (Attil., ap. Cic., Att., 14, 20, 3): hic in illo sibi, in hoc alius indulget. To ride one’s hobby-horse, ineptiis suis plaudere (Tac., Dial., 32, extr.). Vid: “FAVORITE pursuit.

Quick answer

What is the Latin word for hobby, hobby-horse?
The usual Latin words for “hobby, hobby-horse” are harundō, studium, ineō. 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.