the digestive system

stomachache

stomach ache [noun]
US /ˈstʌm·ək ˌeɪk/ 
Example: 

I ate too much food and got a severe stomach ache.

Pain in your stomach

Persian equivalent: 
Example: 

I ate too much food and got a severe stomach ache.

Oxford Essential Dictionary

stomach ache

 noun (no plural)
a pain in your stomach:
I've got stomach ache.

Longman Dictionary of Contemporary English

stomachache

stomachache /ˈstʌmək-eɪk/ BrE AmE noun [uncountable and countable]
pain in your stomach or near your stomach
• • •
THESAURUS
stomachache pain in your stomach or near your stomach: He said he had a stomachache and didn't want to go to school. | I've got bad stomachache.
indigestion pain or uncomfortable feelings that you get when your stomach cannot break down food that you have eaten: She frequently suffered from indigestion. | If I eat onions, they give me indigestion.
food poisoning a stomach illness caused by eating food that contains harmful bacteria, so that you vomit: I got food poisoning while I was on holiday and had to spend the day in bed. | Two of the customers has to be taken to hospital with suspected food poisoning.
nausea the feeling that you have when you think you are going to vomit: A feeling of nausea suddenly came over me.
constipation the condition of having difficulty in getting rid of solid waste from your body: Do you suffer from constipation?
diarrhoea British English, diarrhea American English an illness in which waste from the bowels is watery and comes out often: The main symptoms are diarrhoea and vomiting. | Some dairy products can cause diarrhoea.

Oxford Advanced Learner's Dictionary

stomach ache

ˈstomach ache [stomach ache]       noun countable, uncountable

pain in or near your stomach

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition
 

ˈ stomach ˌ ache noun [ C or U ]

A2 pain in your stomach:

I ate too much and got a terrible stomach ache.

© Cambridge University Press 2013

Collins COBUILD Advanced Learner’s English Dictionary

stomach ache

also stomachache
(stomach aches)

If you have a stomach-ache, you have a pain in your stomach.

N-VAR

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary: 

stomachache
stom·ach·ache /ˈstʌməkˌeɪk/ noun, pl -aches : pain in or near your stomach

[count]
• Eating too much food will give you a stomachache.

[noncount]
• Side effects include gas, bloating, and stomachache.

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