ज्योतिस्

Sanskrit

From the root ज्युत् (jyut), a corruption of द्युत् (dyut).

ज्योतिस् • (jyótis) stem, n

light (of the sun, dawn, fire, lightning)
- c. 1700 BCE – 1200 BCE, Ṛgveda 8.6.30:
  आदित्प्र॒त्नस्य॒ रेत॑सो॒ ज्योति॑ष्पश्यन्ति वास॒रम्।
  प॒रो यदि॒ध्यते॑ दि॒वा॥
  ā́dítpratnásya rétaso jyótiṣpaśyanti vāsarám.
  paró yádidhyáte divā́.
  Then verily, they see the light resplendent of primeval seed, kindled on yonder side of heaven.
brightness (of the sky)
light appearing in the 3 worlds, viz. on earth, in the intermediate region, and in the sky or heaven
1. the fire on earth
2. the sun or moon in the sky (used in the dual form to imply both of them)
3. ether or air in the intermediate region
flash of lightning
moonlight
the light of the eyes
the eye
(in the plural) the heavenly bodies, planets and stars
course or movements of the heavenly bodies
science of the movements of the heavenly bodies
the light of heaven, celestial world
light as the divine principle of life or source of intelligence, intelligence
name of several ekāhas
a metre of 32 short and 16 long syllables
a mystical name for the letter ra

Neuter is-stem declension of ज्योतिस् (jyótis)
	Singular	Dual	Plural
Nominative	ज्योतिः jyótiḥ	ज्योतिषी jyótiṣī	ज्योतींषि jyótīṃṣi
Vocative	ज्योतिः jyótiḥ	ज्योतिषी jyótiṣī	ज्योतींषि jyótīṃṣi
Accusative	ज्योतिः jyótiḥ	ज्योतिषी jyótiṣī	ज्योतींषि jyótīṃṣi
Instrumental	ज्योतिषा jyótiṣā	ज्योतिर्भ्याम् jyótirbhyām	ज्योतिर्भिः jyótirbhiḥ
Dative	ज्योतिषे jyótiṣe	ज्योतिर्भ्याम् jyótirbhyām	ज्योतिर्भ्यः jyótirbhyaḥ
Ablative	ज्योतिषः jyótiṣaḥ	ज्योतिर्भ्याम् jyótirbhyām	ज्योतिर्भ्यः jyótirbhyaḥ
Genitive	ज्योतिषः jyótiṣaḥ	ज्योतिषोः jyótiṣoḥ	ज्योतिषाम् jyótiṣām
Locative	ज्योतिषि jyótiṣi	ज्योतिषोः jyótiṣoḥ	ज्योतिःषु jyótiḥṣu

Monier Williams (1899) “ज्योतिस्”, in A Sanskrit–English Dictionary, , new edition, Oxford: At the Clarendon Press, →OCLC, page 427.
Turner, Ralph Lilley (1969–1985) “jyotis”, in A Comparative Dictionary of the Indo-Aryan Languages, London: Oxford University Press