阑⇒ 阑尾 lánwěi, [闌尾], appendix/vermiform appendix (anatomy) 阑尾炎 lánwěiyán, [闌尾炎], appendicitis (medicine) 阑 lán, [闌], railing/balustrade/door-screen/exhausted/late 夜阑人静 yèlánrénjìng, [夜闌人靜], the still of the night (idiom)/late at night
殚⇒ 殚精竭虑 dānjīngjiélǜ, [殫精竭慮], to exhaust one's thoughts and ingenuity (idiom); to think sth through thoroughly...