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maternal mother
Relating to or characteristic of a mother or motherhood; motherly: maternal instinct.
Inherited from one's mother: a maternal trait.
Related through one's mother: my maternal uncle.
adj.
1. 母亲的; 似母亲的
2. 母系的
3. 从母方继承的

例句：
She showed her daughter's picture with maternal pride.
她怀着作为母亲的自豪感拿出女儿的照片给人看。

maternity
The state of being a mother; motherhood.
The feelings or characteristics associated with being a mother; motherliness.
A maternity ward.
Relating to or effective during pregnancy, childbirth, or the first months of motherhood:
n.
1.母性; 母道; 怀孕
2.产科病房；产科医院
adj.产妇的, 产后的, 怀孕的

例句：
Trainee nurses have to work for some weeks in maternity.
受训的护士必须在产科病房工作数周。

matron
A married woman or a widow, especially a mother of dignity, mature age, and established social position.
A woman who acts as a supervisor or monitor in a public institution, such as a school, hospital, or prison.
n.
1. 年长的已婚妇女(尤指品格高尚的)
2. 主妇; 保姆
3. (学校等的)女主任; 女舍监; 护士长; (妇女组织等的)女主席; 总干事

matrix
A situation or surrounding substance within which something else originates, develops, or is contained
The womb
Mathematics A rectangular array of numeric or algebraic quantities subject to mathematical operations.
A mold or die
n.
1.母体，发源地：可产生、发展或包含其它物的地点或环境；子宫
2.【数学】矩阵：用于数学运算的数值量和代数量的矩形阵列；模型或模具

例句：
“Freedom of expression is the matrix, the indispensable condition, of nearly every form of freedom”(&b{Benjamin N. Cardozo})
“言论自由几乎是任何一种自由形式的母体和不可缺少的条件”(本杰明N.卡多佐)

matrimony
The act or state of being married; marriage.
n.结婚, 婚姻; 夫妇关系, 婚姻生活, 婚礼

例句：
He had got his neck out of the yoke of matrimony.
他已经摆脱了婚姻的枷锁。

metropolis

词汇起源
16] A metropolis is etymologically a ‘mother city’. The word comes via late Latin mētropolis from Greek mētrópolis, a compound formed from métēr ‘mother’ (a distant relative of English mother) and pólis ‘city’ (source of English police, policy, politics, etc).

A major city, especially the chief city of a country or region: Chicago, the metropolis of the Midwest.
A city or an urban area regarded as the center of a specific activity: a great cultural metropolis.
Ecclesiastical. The chief see of a metropolitan bishop.
The mother city or country of an overseas colony, especially in ancient Greece.
n.
1.大都市;首都;首府[the S]
2.(工商业等的)中心都市,中心[C]

metropolitan
Of, relating to, or characteristic of a major city: crowded metropolitan streets; a metropolitan newspaper. Of or constituting a large city or urbanized area, including adjacent suburbs and towns: the Dallas-Fort Worth metropolitan area; a metropolitan county.
Of, relating to, or constituting the home territory of an imperial or colonial state.
A citizen of a metropolis, especially one who displays urbane characteristics, attitudes, and values.
adj. 主要城市的；大城市的；大都会的；属大城市的；具有大城市居民气派的
n. 大城市人；具有大城市气派的人

例句：
Metropolitan residents are used to fast rhythm.
大都市的居民习惯于快节奏。