Etymology
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flatland (n.)
1735, from flat (adj.) + land (n.). Edwin Abbott's popular book about an imaginary two-dimensional world was published in 1884.
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puerperal (adj.)

"of or pertaining to childbirth; about to give birth," 1768, with -al (1) + Latin puerperus "bringing forth children; bearing a child" (as a noun, "woman in labor"), from puer "child, boy" (see puerility) + parire "to bring forth, bear, produce, create; bring about, accomplish," from PIE root *pere- (1) "to produce, bring forth"). Earlier puerperial (1620s); puarpure (c. 1500). Related: Puerperally.

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patrol (v.)

"to go the rounds in a camp or garrison, march about as a guard," 1690s, from patrol (n.) and in part from French patrouiller. Related: Patrolled; patrolling.

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planetoid (n.)

"one of the asteroids, or minor planets, revolving about the sun between the orbits of Mars and Jupiter," 1803; see planet + -oid. Related: Planetoidal.

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passerine (adj.)

"resembling or relating to a sparrow; of about the size of a sparrow," 1776, from Latin passerinus "of a sparrow," from passer "sparrow," which is of uncertain origin. The noun, "a passerine bird," is 1842, from the adjective.

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router (n.)
"cutter that removes wood from a groove," 1818, from rout "poke about, rummage" (1540s), originally of swine digging with the snout; a variant of root (v.1).
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snuffle (v.)
1580s, from Dutch or Flemish snuffelen "to sniff about, pry," related to Dutch and Flemish snuffen "to sniff" (see snuff (v.2)). Related: Snuffled; snuffling.
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periorbital (adj.)

"of or pertaining to the orbit of the eye," 1838, from medical Latin periorbita, a hybrid from Greek peri "around, about, near" (see peri-) + Latin orbita (see orbit).

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rig (n.2)

"a wanton girl or woman," 1570s, slang, now obsolete, of obscure origin. Also as a verb, "to play the wanton, romp about." Related: Rigged; rigging.

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-algia 
word-forming element denoting "pain," from Greek algos "pain," algein "to feel pain," of unknown origin. Related to alegein "to care about," originally "to feel pain."
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