Middle English Dictionary Entry

zōdiak n.
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Entry Info

Definitions (Senses and Subsenses)

1.
(a) The imaginary celestial circular band or belt bisected by the ecliptic that contains all the positions occupied by the known planets and that is divided into twelve equal portions named after their regnant signs, the zodiac; (b) the zodiac regarded chiefly as a sequence of signs; also in fig. context; signe in (of) the ~, one of the twelve zodiacal signs; also, a portion of the body assigned to the influence of one of the signs [quot. c1475]; (c) the zodiac regarded chiefly as representing the annual course of the sun through the heavens; (d) the zodiac as an example of something putatively susceptible of weighing;—used in fig. context; (e) in combs.: ~ cercle (spere), the circle (sphere) constituting the zodiac.
2.
The part of the astrolabe that represents the celestial zodiac and is used to calculate planetary positions within it.

Supplemental Materials (draft)

Note: An obscure passage in Destruction of Troy, lines 3723-3726, appears to use 'zodias' (uniquely with the -s spelling) as a name for the constellation Gemini, and may represent a misunderstanding of the Latin. It is at least possible that in John Clerk's mind, 'zodias' was a distinct word from 'zodiak,' and had this distinct meaning.