LATIN DICTIONARYLexicon Latīnum
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“disk” in Latin

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

disk
orbis (general term for any circular and flat body): discus (the quoit of the ancients): the moon’s disk, orbis lunae (the face of the moon; Vid: Plin., 2, 9, 6): orbis solis (that of the sun; Vid: Plin., 2, 23, 21): in the shape of a disk, orbiculatus: rotundus; in speciem orbis (if adverbially used).
disk adj.
A little dark, subobscurus (Cic.); subnubilus (Caes.).
A little black, subniger (Varr., ); obater; obniger; nigrans (Plin.); fuscus (Col.).

Quick answer

What is the Latin word for disk?
The usual Latin words for “disk” are orbis, discus, orbiculātus; also rotundus, subobscūrus, subniger. 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.