1.median a．中间的(relating to, located in．or extending toward the middle);n.（三角形）中线(a line that joins a vertex of a triangle to the midpoint of the opposite side);中数(把观测值按大小次序捧剜后，捧在中间位置的数值)(the middle value in a distribution, above and below which lie an equal number of values)
词根记忆：medi(中间)+an--中间的--中数
2.mediate v.调解(to reconcile differences)；作为媒介引起(to effect by action as an intermediary); a.居中的(occupying a middle position)
词根记忆：medi(中间)+ate --在中间起作用--作为媒介引起；调解
注意：meditate(v.沉思)
例：One immunological（免疫的）reaction is mediated through the lymphocytes(淋巴细胞)．
派生词：mediation(n.调停)；mediator(n.调解人；介质)
3.medication n.药物疗法（the act or process of treating with medicine）；药物，药剂(medicament)
词根记忆：medic(医疗，治疗)+ation--药物
例：Physicians have the final say as to whether to prescribe a medication for a patient.
4.medieval a．中世纪的，中古的(relating or belonging to the Middle Ages)
词根记忆：medi(中间)+ev(时代)+al--中世纪的，中古的
例：In medieval society, breaking ones word had serious consequences.
5.medium a．中等的(intermediate in quantity, quality position, size, or degree);n．[pl. media]媒体(an agency by which something is accomplished, conveyed, or transferred)
词根记忆：medi(中间)+um --中间的--中等的
例：small and medium-sized businesses，，The news medium focuses peoples attention most strongly on local crimes.
6.megacity n.大城市(metropolis)
词根记忆：mega(巨大的)+city(城市)--大城市
例：The population of megacity , a sprawling metropolis in Remsland, has grown at a fairly steady rate for over a century.
7.megalithic a．巨石制的(being made of megalith)
词根记忆：来自megalith(n.巨石)
例：The megalithic monument is nearly 2,000 years old.
8.melancholy a．忧郁的(sad, unhappy)
联想记忆：melan(黑色)+chol( =bile胆汁)+y--胆汁发黑--忧郁的
例：The twentieth century is regarded as an age of fretfulness and melancholy skepticism.
9.meld v.（使）混合,（使）合并(to blend, mix)
例：Often billed as The Genius, American pianist, singer, composer, and bandleader Ray Charles is credited with the early development of soul music , a genre based on a melding of gospel, rhythm and blues, and jazz.