Etymology
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Words related to thanatology

thanato- 
before vowels thanat-, word-forming element meaning "death," from Greek thanatos "death," from PIE *dhwene- "to disappear, die," perhaps from a root meaning "dark, cloudy" (compare Sanskrit dhvantah "dark"). Hence Bryant's "Thanatopsis", with Greek opsis "a sight, view."
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-logy 

word-forming element meaning "a speaking, discourse, treatise, doctrine, theory, science," from Greek -logia (often via French -logie or Medieval Latin -logia), from -log-, combining form of legein "to speak, tell;" thus, "the character or deportment of one who speaks or treats of (a certain subject);" from PIE root *leg- (1) "to collect, gather," with derivatives meaning "to speak (to 'pick out words')." Often via Medieval Latin -logia, French -logie. In philology "love of learning; love of words or discourse," apology, doxology, analogy, trilogy, etc., Greek logos "word, speech, statement, discourse" is directly concerned.

Athanasian (adj.)
1580s, "pertaining to Athanasius" (c. 296-373), bishop of Alexandria in the reign of Constantine. The name is Latin, from Greek Athanasios, from athanatos "immortal," from a- "not, without" (see a- (3)) + thanatos "death" (see thanatology). The anti-Arian creed attributed to him was perhaps not his work.
euthanasia (n.)
1640s, "a gentle and easy death," from Greek euthanasia "an easy or happy death," from eu- "good" (see eu-) + thanatos "death" (see thanatology) + abstract noun ending -ia. Slightly earlier in Englished form euthanasy (1630s). Sense of "legally sanctioned mercy killing" is recorded in English by 1869.
tansy (n.)
perennial herb native to northern Eurasia, mid-13c., from Old French tanesie (13c., Modern French tanaisie), from Vulgar Latin *tanaceta (neuter plural mistaken for fem. singular), from Late Latin tanacetum "wormwood," from shortened form of Greek athanasia "immortality," from athanatos "immortal," from a- "not," privative prefix, + thanatos "death" (see thanatology). So called probably for its persistence. English folklore associates it with pregnancy, either as an aid to contraception or to provoke miscarriage.