Etymology
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bioclimatology (n.)
also bio-climatology, "study of climate in relation to living organisms," 1911; see bio- + climatology.
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POSSLQ 
1979, acronym from person of opposite sex sharing living quarters; it never was an official category.
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hypogean (adj.)

"living below the ground," 1803, from Greek hypogeios "underground," from hypo "under" (see hypo-) + "earth" (see Gaia). Opposed to epigean.

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wellspring (n.)
Old English welspryng "living spring, fountainhead," literal and figurative; see well (n.) + spring (n.2).
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bon-vivant (n.)
also bon vivant, "jovial companion, one fond of good living," 1690s, French (see bon); the fem. is bonne vivante.
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predacious (adj.)

also predaceous, "living by prey, disposed to prey or plunder, predatory," 1713, from stem of predation (Latin praedari) + -acious.

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xerophagy (n.)
"habit of living on dry food," especially as a form of fasting, 1650s, from xero- "dry" + -phagy "eating" (see -phagous).
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boulevardier (n.)
1856, a French word in English, "one who frequents the boulevard;" i.e. "man-about-town, one fond of urban living and society."
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stylite (n.)
ascetic living on the top of a pillar, 1630s, from Ecclesiastical Greek stylites, from stylos "pillar," from PIE root *sta- "to stand, make or be firm."
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carotenoid (n.)
"carotene-like pigment found in living things," 1913, from German carotinoïde (1911), from carotin (see carotene) + -oid.
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