There are 2 definitions of gibber in English:

gibber1

Syllabification: gib·ber
Pronunciation: /ˈjibər
 
/

verb

[no object]
Speak rapidly and unintelligibly, typically through fear or shock: they shrieked and gibbered as flames surrounded them (as adjective gibbering) a gibbering idiot
More example sentences
  • Somehow, it left me almost gibbering with fear.
  • By this stage I wasn't babbling, more like gibbering.
  • The day will come, soon enough, when I'm gibbering, and incoherent, but right now I'm in control and I don't want anyone else to know.
Synonyms

Origin

early 17th century: imitative.

Definition of gibber in:

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Word of the day antebellum
Pronunciation: ˌantēˈbeləm
adjective
occurring or existing before a particular war…

There are 2 definitions of gibber in English:

gibber2

Line breaks: gib¦ber
Pronunciation: /ˈgɪbə/

Entry from British & World English dictionary

(also gibber stone)

noun

Australian
1A stone or boulder forming part of a boulder plain.
1.1Any small stone.

Origin

from Dharuk giba 'stone'.

Definition of gibber in:

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Word of the day antebellum
Pronunciation: ˌantēˈbeləm
adjective
occurring or existing before a particular war…