Looking in the Monier-Williams Sanskrit-English Dictionary maintained at the University of Cologne we see:
Tantra - loom, the warp (in weaving), essential part, system, framework, army, drug, string of a lute 1 tántra a loom, the warp 2 the leading or principal or essential part , main point , characteristic feature , model , type , system , framework 3 "the principal action in keeping up a family i.e. propagation" 4 doctrine, rule, theory, scientific work, chapter of such a work (esp. the 1st section of a treatise on astronomy) 5 a class of works teaching magical and mystical formularies (mostly in the form of dialogues between śiva and durgā and said to treat of 5 subjects, 1. the creation, 2. the destruction of the world, 3. the worship of the gods, 4. the attainment of all objects, esp. of 6 superhuman faculties, 5. the 4 modes of union with the supreme spirit by meditation 6 a spell 7 oath or ordeal L. 8 an army (cf. °trin) BhP. x , 54 , 15 9 a row , number , series , troop Ba1lar. ii f. , vi 10 rājya-t° , government Das3. xiii S3is3. ii , 88 11 a means which leads to two or more results , contrivance Hariv. ii , 1 , 31 12 a drug (esp. one of specific faculties) , chief remedy cf. °trā*vāpa 13 wealth L. 14 a house L. 15 happiness W. 16 the wire or string of a lute
tántrī - the strings of the heart Hariv. 3210 (v.l.) tántrī any tubular vessel of the body , sinew , vein
Ras - To taste, relish, to feel, perceive, be sensible of
to roar , yell , cry , sound , reverberate S3Br. &c ; to praise Naigh. iii , 14 : Caus. rāsayati (aor. arīrasat) , Gr.: Desid. rirasiṣati ib. : Intens. rārasyate (or rārasti , Gr.) , to cry out loudly , scream aloud. to taste , relish S3Br. Up. MBh. &c ; to feel , perceive , be sensible of Sa1h. ; to love Dha1tup. : Desid. rirasayiṣati , to desire to taste.
Rasa - sap, juice, essence, water, liquor, semen, gold, taste, flavor, taste or character of a work
the sap or juice of plants , Juice of fruit , any liquid or fluid , the best or finest or prime part of anything , essence , marrow RV. &c
water , liquor , drink MBh. Ka1v. &c
juice of the sugar-cane , syrup Sus3r.
any mixture , draught , elixir , potion R. BhP.
melted butter L.
(with or scil. gavām) milk MBh.
(with or scil. viṣasya) poison Das3. Ra1jat.
soup , broth L.
a constituent fluid or essential juice of the body , serum , (esp.) the primary juice called chyle (formed from the food and changed by the bile into blood) ib.
mercury , quicksilver (sometimes regarded as a kind of quintessence of the human body , else where as the seminal fluid of śiva) Sarvad.
semen virile RV. i , 105 , 2
any mineral or metallic salt Cat.
a metal or mineral in a state of fusion (cf. upa- , mahā-r°)
Vanguieria Spinosa L.
a species of amaranth L.
green onion L.
= amṛta L.
taste , flavour (as the principal quality of fluids , of which there are 6 original kinds , viz. madhura , sweet ; amla , sour ; lavaṇa , salt ; kaṭuka , pungent ; tikta , bitter ; and kaṣāya , astringent ; sometimes 63 varieties are distinguished , viz. beside the 6 original ones , 15 mixtures of 2 , 20 of 3 , 15 of 4 , 6 of 5 , and 1 of 6 flavours) S3Br. &c
N. of the number " six " VarBr2S. S3rutab.
any object of taste , condiment , sauce , spice , seasoning MBh. Ka1v. &c
the tongue (as the organ of taste) BhP.
taste or inclination or fondness for (loc. with or scil. upari , or comp.) , love , affection , desire MBh.
charm pleasure , delight ib.
(in rhet.) the taste or character of a work , the feeling or sentiment prevailing in it (from 8 to 10 rasas are generally enumerated , viz. śṛṅgāra , love ; vīra , heroism ; bībhatsa , disgust ; raudra , anger or fury ; hāsya , mirth ; bhayānaka , terror ; karuṇa , pity ; adbhuta , wonder ; śānta , tranquillity or contentment ; vātsalya , paternal fondness ; the last or last two are sometimes omitted ; cf. under bhāva) Bhar. Das3ar. Ka1vya7d. &c
the prevailing sentiment in human character Uttarar. Ra1jat.
(with vaiṣṇavas) disposition of the heart or mind , religious sentiment (there are 5 rasas or ratis forming the 5 degrees of bhakti q.v. , viz. śānti , dāsya , sākhya , vātsalya , and mādhurya) W.
a kind of metre Pin3g.
N. of the sacred syllable , " Om ".
the son of a niṣāda and a śanakī L.
“Yoga is a living tradition. Lorin is on the front lines as a meditation teacher, a champion of natural meditation, of awakening consciousness everywhere, in all places, in all times. He is bringing over into the Western world the deepest teachings of Tantra, giving them voice to sing out clearly.” Shiva Rea, Samudra School of Living Yoga “Lorin Roche really knows his stuff.” Jack Kornfield, co-founder of the Insight Meditation Society and of the Spirit Rock Meditation Center.
“Lorin Roche is probably the friendliest meditation teacher in America.” James Fadiman, cofounder of the Institute of Transpersonal Psychology." The Radiance Sutras is a fresh translation of an ancient Tantra Yoga text, The Vijnana Bhairava Tantra, a love song between Devi and Bhairava, (Shakti and Shiva) in which they sing the classic tantra, chakra, kundalini, mantra, mudra practices.
“This is my favorite text of all time.” —Shiva Rea