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apophatic (adj.): "involving a mention of something one feigns to deny; involving knowledge obtained by negation," 1850, from Greek apophatikos, from apophasis "denial, answer," from apophanai "to speak off," from apo- "off" (see apo-) + phanai "to speak," related to pheme "voice," from PIE root *bha- (2) "to speak, tell, say" (see fame (n.)).
emphatic (adj.): 1708, from Latinized form of Greek emphatikos, variant of emphantikos, from stem of emphainein (see emphasis). Emphatical is earlier (1550s in rhetorical sense, 1570s as "strongly expressive"). Related: Emphatically (1580s).
lymphatic (adj.): 1640s, from Latin lymphaticus, from lympha (see lymph). Also sometimes used in the classical Latin sense "mad, frenzied," which was the primary sense of lymphaticus in Latin: OED reports this "difficult to account for," but perhaps due to association of lympha with nymphe; compare Greek nymphian "to be frenzy-stricken."
phatic (adj.): 1923, coined by Polish-born British anthropologist Bronisław Malinowski (1884-1942) from Greek phatos "spoken, that may be spoken," from phanai "to speak, say," from PIE root *bha- (2) "to speak, tell, say" (see fame (n.)) + -ic.
aliphatic: "Relating to or denoting organic compounds in which carbon atoms form open chains (as in the alkanes), not aromatic rings", Late 19th century (originally used of the fatty acids): from Greek aleiphar, aleiphat- 'fat' + -ic.