There is no difference apart from the USA's penchant to change the spelling from re to er.
Meagre can be defined as lacking in quantity. That is how you use it.
A body meager with hunger will result from a meager diet.
British spelling: meagre
The word meager (UK spelling meagre) is an adjective meaning "deficient in quality".
The alternate spelling of the word meager is meagre. This is a less common spelling and is often thought of as an inappropriate alternate.
meagre, meager, minute
No. The word meagre or meager has an EA vowel pair with a long E sound (me), while the second E is part of a schwa-R sound (er/ur).
You would need to go through the dictionary, past meager until you were getting to the "meagr" words and there you would find meagre. I think it will be affected, however on what sort of dictonary you are using, (e.g American english or english). I hope this answers your question :)
Meagre Manual
You are so meagre!
My minimum wage job provides me with a meagre existence.
Some synonyms for meager:BareBleakFeebleFrugalInadequateInsignificantLittleLowMereMinimumPoorScantScantyScarceShortSlenderSlightSlimSmallSparseStingyTenuous