READING  セイ、(ショウ)、い
MEANING  well
JLPT level N1 (full info & stroke order)
 
Words/compounds
いど
water well
いどほり
well digging, well digger
ゆせい
oil well
いのなかのかわずたいかいをしらず
parochial, provincial, used to encourage someone to get a wider perspective
いのなかのかわず
person who is ignorant of the real world (lit: frog in a well)
 
Example sentences
井戸
水道水で年1回、井戸水なら年2回の水質検査をお勧めします。
We recommend that mains water have a water-quality test carried out once a year, well water twice a year.
井戸掘り
彼の仕事は井戸掘りからゴミの処理にまで及ぶ。
His tasks range from digging wells to getting rid of garbage.
油井
その油井はたくさんの原油を産出する。
The well delivers a great deal of oil.
 
Lookalikes
 
どんぶり、(どん) 
bowl of food
 
イ、かこ-む、かこ-う 
surround
 
コウ、たがや-す 
till