banana

a long curved fruit with a thick yellow skin and soft flesh, that grows on trees in hot countries
• a bunch of bananas
Idiom: go bananas
Word Origin:
late 16th cent.: via Portuguese or Spanish from Mande. Mande is a group of Niger-Congo languages spoken by the Mande people of West Africa.
Example Bank:

• The company has acquired an unhappy knack of slipping on banana skins.

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition

banana / bənɑ.nə /    / -næn.ə / noun [ C or U ]

banana A1 a long, curved fruit with a yellow skin and soft, sweet, white flesh inside:
a bunch of bananas
banana milkshake

Collins COBUILD Advanced Learner’s English Dictionary

banana

/bənɑ:nə, -næn-/
(bananas)

1.
Bananas are long curved fruit with yellow skins.
...a bunch of bananas.
N-VAR

2.
If someone is behaving in a silly or crazy way, or if they become extremely angry, you can say that they are going bananas. (INFORMAL)
Adamson’s going to go bananas on this one.
ADJ: v-link ADJ

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary:

banana

ba·nana /bəˈnænə, Brit bəˈnɑːnə/ noun, pl -nan·as [count, noncount] : a long curved fruit with a thick peel that is yellow when it is ripe
• a bunch of bananas
• peel a banana
• (US) a banana peel = (Brit) a banana skin
✦In British English banana skin is used figuratively to describe a foolish or embarrassing mistake or failure.
• a director who has