1
citrus + noun
citrus 是名词，但常直接放在 tree、fruit、flavor 等名词前作定语；作定语时它本身不随被修饰词变复数。
Citrus trees need a warm climate.
柑橘树需要温暖的气候。
柑橘；柑橘类水果
citruses — plural of citrus
先理解核心含义，再看它在真实句子里的用法。
柑橘；柑橘类水果
any fruit of the genus Citrus, such as an orange or lemon, with a thick skin and juicy flesh, grown in warm regions
Citrus trees need a warm climate.
柑橘树需要温暖的气候。
Any of several shrubs or trees of the genus Citrus in the family Rutaceae.
柑橘类水果
any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions
The fruit of such plants, generally spherical, oblate, or prolate, consisting of an outer glandular skin (called zest), an inner white skin (called pith or albedo), and generally between 8 and 16 sectors filled with pulp consisting of cells with one end attached to the inner skin. Citrus fruits include orange, grapefruit, lemon, lime, and citron.
柑橘属常绿树
any of numerous tropical usually thorny evergreen trees of the genus Citrus having leathery evergreen leaves and widely cultivated for their juicy edible fruits having leathery aromatic rinds
A citrus needs plenty of sunlight to produce sweet fruit.
柑橘属果树需要充足的阳光才能结出甘甜的果实。
The shop sells different citruses, from oranges to lemons.
这家店出售各种柑橘类水果，从橙子到柠檬都有。
We added fresh citrus to the dressing for a tangy flavor.
我们在调味汁里加了新鲜柑橘，带来一股酸爽的味道。
citrus 是名词，但常直接放在 tree、fruit、flavor 等名词前作定语；作定语时它本身不随被修饰词变复数。
Citrus trees need a warm climate.
柑橘树需要温暖的气候。
citrus 作可数名词时，可用 a citrus 指单个柑橘类果实；复数形式为 citruses，但日常表达更常说 citrus fruits。
A citrus has a thick rind and juicy pulp.
柑橘类水果果皮厚，果肉多汁。
Not this
I bought three citrus.
Use this
I bought three citruses.
citrus 是可数名词，复数为 citruses；在具体数字后必须用复数形式，不应像不可数名词一样使用单数。
Not this
Citric fruits are good for your health.
Use this
Citrus fruits are good for your health.
citric 意为“柠檬酸的”，用来修饰酸类物质；表示“柑橘属水果”时要用 citrus 作定语，构成 citrus fruits。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
柑橘类水果
Oranges and lemons are the most common citrus fruits.
橙子和柠檬是最常见的柑橘类水果。
柑橘树
They grow citrus trees in their garden.
他们在花园里种柑橘树。
柑橘园
The citrus groves were heavy with fruit.
柑橘园里果实累累。
柑橘果皮
Add some grated citrus peel to the cake.
在蛋糕里加一些磨碎的柑橘果皮。
柑橘风味
This tea has a bright citrus flavor.
这种茶有清新的柑橘风味。
Use citruses naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想字母 C：citrus 以 C 开头，切开的柑橘剖面也像个 C，记住它指柑橘类水果。
语域：neutral 常见场景：日常饮食、食品标签、植物介绍 该词在日常和书面语境中都常用，通常指柑橘类水果或柑橘属果树，语气中性，没有明显的正式或随意倾向。
复数形式除 citruses 外也可见 citri。
Dictionary facts from ECDICT, WIKTIONARY.