弟 means 'younger brother'

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Strokes : 7    Frequency: 725   JLPT: N4    Usefulness: 2    Study set: 2-9    Grade: 2   Intermediate lesson: 14    Beginner lesson: -   Begins 22 words   Used in 87 words   Used in 71 names   Component in 16 kanji (0 Jōyō)
Jōyō (常用)
   ダイ   テイ   デ
   おとうと younger brother
⿱   () eight  ⿹   mourn   () katakana 'no'; whereupon; splitting away from  
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 elder brother; brother  
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In the most useful 10,000 words in Japanese, 弟 is used 4 times, read 4 ways.
Across all words in Japanese, 弟 is used 66 times, read 4 ways. 1 word uses a non-standard reading.
テイ : 27 words FIND ALL
2 1
young(er) people; children
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ダイ : 17 words FIND ALL
1. siblings; brothers and sisters  (see also: ご兄弟)
2. brothers
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デ : 14 words FIND ALL
pupil; disciple; adherent; follower; apprentice; young person; teacher's student-helper
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おとうと : 7 words FIND ALL
1. younger brother; little brother; kid brother  (humble)
2. pupil; apprentice  (archaic; this meaning is restricted to reading てい)
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Part of a non-standard reading: 1 word. FIND ALL
cousin (male)  (see also: 従姉妹; often written with kana only)
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An additional 兄 less common words include 弟 but the reading has not yet been categorized.
Henshall: 194 (originally: 177)  Joy o' Kanji : 177  Key to Kanji: 768 

Cascading kanji view

ダイ   テイ   デ   おとうと younger brother   
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katakana 'no'; whereupon; splitting away from
チョウ    mourning   とむら to mourn, condole   
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キュウ   ゆみ a bow   
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