most sidereal

adjective Astronomy.

determined by or from the stars: sidereal time.

of or pertaining to the stars.

Origin:
1625–35; < Latin sīdere(us) of, belonging to the stars (sīder-, stem of sīdus star, constellation + -eus adj. suffix) + -al¹

Related forms

si·de·re·al·ly, adverb

non·si·de·re·al, adjective

un·si·de·re·al, adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins

World English Dictionary

sidereal (saɪˈdɪərɪəl)

—*adj*
1.	of, relating to, or involving the stars
2.	determined with reference to one or more stars: the sidereal day

[C17: from Latin sīdereus, from sīdus a star, a constellation]

si'dereally

—*adv*

Collins English Dictionary - Complete & Unabridged 10th Edition
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Most sidereal is always a great word to know.

So is ort. Does it mean:

a fool or simpleton; ninny.

a scrap or morsel of food left at a meal.

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Etymonline

Word Origin & History

sidereal

1634, "of or pertaining to the stars," earlier sideral (1594), from Fr. sidereal (16c.), from L. sidereus "starry, astral," from sidus (gen. sideris) "star, constellation," probably from PIE base *sweid- "to shine" (cf. Lith. svidus "shining, bright").

American Heritage

Science Dictionary

sidereal

(sī-dîr'ē-əl) Pronunciation Key

Relating to the stars or constellations.
Measured with respect to the background of fixed stars instead of the Sun.

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