LATIN DICTIONARYLexicon Latīnum
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“spur” in Latin

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

spur s.
calcar (of a boot; also of a fighting-cock: it is only in the poets that it is IMPROP. = incitement, impulse, etc.; though the whole phrase “to set spurs to,” “to need the spur,” etc., is used IMPROP.): radius (of a fighting-cock): stimulus: aculeus: incitamentum (figuratively = an incitement). To set or put spurs to, equo calcaria subdere; equum calcaribus concitare or stimalare (PROP.); alicui calcaria adhibere or admovere (PROP. or figuratively); aliquem stimulare or incitare (figuratively). To require the spur (IMPROP.), egere calcaribus (opposed to egere frenis, Cic.). Anything is a great spur to anything (figuratively), est aliquid maximum alicujus rei incitamentum.
spur v.
alicui calcaria subdere: aliquem calcaribus concitare (PROP.): alicui calcaria adhibere or admovere (PROP. or figuratively). To spur a horse on, (equum) calcaribus stimulare: to spur anybody on (figuratively), stimulos subdere alicujus animo; calcaria alicui adhibere or admovere, or addere; calcaribus uti in aliquo; aliquem incitare ad aliquid.

Quick answer

What is the Latin word for spur?
The usual Latin words for “spur” are calcar, radius, stimulus; also aculeus, incitāmentum, admoveō. 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.