From Merriam-Webster Online:
Etymology: Latin insidiosus, from insidiae ambush, from insidEre to sit in, sit on, from in- + sedEre to sit
1 a : awaiting a chance to entrap : treacherous b : harmful but enticing : seductive (insidious drugs)
2 a : having a gradual and cumulative effect : subtle (the insidious pressures of modern life) b of a disease : developing so gradually as to be well established before becoming apparent
- in·sid·i·ous·ly adverb
- in·sid·i·ous·ness noun
From The U.S. Global Change Research Information Office:
Etymology: from Greek thermE heat + German karst irregular limestone region
: a range of features formed in areas of low relief when permafrost with excess ice thaws. These are unevenly distributed and include hummocks and mounds, water- filled depressions, 'drunken' forests, mud flows on sloping ground, new fens, and other forms of thaw settlement that account for many of the geotechnical and engineering problems encountered in periglacial landscapes. Even where repeated ground freezing takes place, thermokarst features, once formed, are likely to persist.
From Rei Nakazawa, Magic creative text writer:
Etymology: When Urza was first forming his plan to fight the Phyrexians, he decided to create artificial beings to fight the artificial beings the Phyrexians had made themselves. He called them "Metathran" after the prefix "meta-," which is often used to indicate superiority, and "Thran," which is the name of the long-dead race the Phyrexians belonged to before they turned themselves into half-mechanical monstrosities.