深密 (saṃdhi). Deep or profound teaching.

saṃ-dhí mfn. containing a conjunction or transition from one to the other &c. TBr
• m. (exceptionally f. ; once in MBh. loc. pl. saṃdhīṣu) junction, connection, combination, union with (instr.) KaṭhUp. Subh
• association, intercourse with (instr.) MBh
• comprehension, totality, the whole essence or scope of (comp.) Pañcat
• agreement, compact TBr
• alliance, league, reconciliation, peace between (gen.) or with (instr. with or without saha), making a treaty of peace, negotiating alliances (one of a king's six courses of action, guṇa
• many kinds are specified, e.g. adṛṣṭa-puruṣa, ucchinna, kāñcana, kapāla, saṃtāna, qq. vv.) Mn. Yājñ. Hit. &c
• euphonic junction of final and initial letters in grammar (every sentence in Sanskṛit being regarded as a euphonic chain, a break in which occurs at the end of a sentence and is denoted by a Virāma or Avasāna, 'stop'
• this euphonic coalition causing modifications of the final and initial letters of the separate words of a sentence and in the final letters of roots and stems when combined with terminations to form such words) Prāt. Kathās. Sāh
• contrivance, management Ragh. Daś
• place or point of connection or contact, juncture, hinge, boundary, boundary line TS. Āpast. MBh. &c
• critical juncture, crisis, opportune moment MW
• a joint, articulation (of the body
• esp. applied to the five junctures of the parts of the eye) RV. &c. &c
• interstice, crevice, interval MBh
• the space between heaven and earth, horizon ŚBr. GṛŚrS
• the interval between day and night, twilight (= saṃ-dhyā) VS. &c. &c
• a seam Amar
• a fold Pañcat
• a wall or the hole or cavity or breach in a wall made by a housebreaker (acc. with √chid or bhid or Caus. of ut-√pad, 'to make a breach in a wall') Mn. Mṛicch. Daś
• the vagina or vulva L
• a juncture or division of a drama (reckoned to be five, viz. mukha, pratinukha, garbha, vimarśa, and nirvahaṇa, qq. vv
• or one of the 14 kinds of nirvahaṇa or catastrophe) Bhar. Daśar. &c
• a period at the expiration of each Yuga or age (equivalent to one sixth of its duration and intervening before the commencement of the next
• occurring also at the end of each Manv-antara and Kalpa) W
• a pause or rest ib
• a part, portion, piece of anything AitBr. Hariv. Naish. Sch
• a partic. Stotra Br
• (in mensuration) the connecting link of a perpendicular ib
• the common side of a double triangle, Śulbas
• = sâvakāśa L
• N. of a son of Prasuśruta BhP
• f. N. of a goddess presiding over junction or union VS

Sanskrit-English Dictionary, by M. Monier William