योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-81, verse-99

तमःप्रकाशयोश्छायातपयोर्दिनरात्रयोः ।
मध्ये विलक्षणं रूपं प्राज्ञैरपि न लभ्यते ॥ ९९ ॥

tamaḥprakāśayośchāyātapayordinarātrayoḥ ,
madhye vilakṣaṇaṃ rūpaṃ prājñairapi na labhyate 99

99. tamaḥ-prakāśayoḥ chāyā-ātapayoḥ dina-rātrayoḥ
madhye vilakṣaṇam rūpam prājñaiḥ api na labhyate

99. tamaḥ-prakāśayoḥ chāyā-ātapayoḥ dina-rātrayoḥ
madhye vilakṣaṇam rūpam prājñaiḥ api na labhyate

99. Between darkness and light, between shade and sunlight, and between day and night, a distinct form or intermediate state is not found even by the wise.

Words meanings summery:

• तमः-प्रकाशयोः (tamaḥ-prakāśayoḥ) - of darkness and light

• छाया-आतपयोः (chāyā-ātapayoḥ) - of shade and sunlight

• दिन-रात्रयोः (dina-rātrayoḥ) - of day and night

• मध्ये (madhye) - in the middle, between, among

• विलक्षणम् (vilakṣaṇam) - distinctive, peculiar, extraordinary, different

• रूपम् (rūpam) - an intermediate form or state (form, shape, nature, appearance, characteristic)

• प्राज्ञैः (prājñaiḥ) - by the wise, by the intelligent

• अपि (api) - (emphasizes the difficulty of finding it) (even, also, too)

• न (na) - not, no

• लभ्यते (labhyate) - is obtained, is found, is perceived

Words meanings and morphology

तमः-प्रकाशयोः (tamaḥ-prakāśayoḥ) - of darkness and light

(noun)

Genitive, dual of tamaḥprakāśa

tamaḥprakāśa - darkness and light

Dvandva compound

Compound type : dvandva (tamas+prakāśa)

• tamas – darkness, gloom, ignorance, inertia (guṇa)
  noun (neuter)
• prakāśa – light, brightness, manifestation, clarity
  noun (masculine)
  From pra- + kāś (to shine)
  Prefix: pra
  Root: kāś (class 1)

Note: Also locative dual.

छाया-आतपयोः (chāyā-ātapayoḥ) - of shade and sunlight

(noun)

Genitive, dual of chāyātapa

chāyātapa - shade and sunlight; heat and cold; light and shade

Dvandva compound of chāyā (shade) and ātapa (sunlight/heat).

Compound type : dvandva (chāyā+ātapa)

• chāyā – shade, shadow, reflection, image
  noun (feminine)
• ātapa – sunlight, heat, sunshine
  noun (masculine)
  From ā- + tap (to heat, burn)
  Prefix: ā
  Root: tap (class 1)

Note: Also locative dual.

दिन-रात्रयोः (dina-rātrayoḥ) - of day and night

(noun)

Genitive, dual of dinarātri

dinarātri - day and night

Dvandva compound of dina (day) and rātri (night).

Compound type : dvandva (dina+rātri)

• dina – day, daytime
  noun (neuter)
• rātri – night
  noun (feminine)
  Root: rā (class 2)

Note: Also locative dual.

मध्ये (madhye) - in the middle, between, among

(indeclinable)

Root: madh

Note: Functions as an adverb here.

विलक्षणम् (vilakṣaṇam) - distinctive, peculiar, extraordinary, different

(adjective)

Nominative, neuter, singular of vilakṣaṇa

vilakṣaṇa - distinctive, peculiar, special, extraordinary, anomalous, contrary

From vi- + lakṣaṇa (mark, characteristic).

Compound type : pradi-samāsa (vi+lakṣaṇa)

• vi – apart, asunder, away, intensely
  indeclinable
  Preposition/prefix
• lakṣaṇa – mark, sign, characteristic, definition, attribute
  noun (neuter)
  From root lakṣ (to mark, perceive)
  Root: lakṣ (class 10)

Note: Also accusative singular neuter.

रूपम् (rūpam) - an intermediate form or state (form, shape, nature, appearance, characteristic)

(noun)

Nominative, neuter, singular of rūpa

rūpa - form, shape, appearance, nature, essential property, beautiful form

Note: Also accusative singular neuter.

प्राज्ञैः (prājñaiḥ) - by the wise, by the intelligent

(noun)

Instrumental, masculine, plural of prājña

prājña - wise, intelligent, knowing; a wise person, an expert

From pra- + jñā (to know) + -a suffix.

Prefix: pra

Root: jñā (class 9)

अपि (api) - (emphasizes the difficulty of finding it) (even, also, too)

(indeclinable)

particle

न (na) - not, no

(indeclinable)

negation particle

लभ्यते (labhyate) - is obtained, is found, is perceived

(verb)

3rd person , singular, passive, present (laṭ) of labh

Present Passive

From root labh (to obtain), passive formation (labh + ya + te).

Root: labh (class 1)