We don't have any synonyms for giss yet.
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Definition of giss:
(n) :
(birdwatching) The general look of a bird.
(n) :
Acronym of Goddard Institute for Space Studies.
(v) :
Pronunciation spelling of guess. [To reach a partly (or totally) unconfirmed conclusion; to engage in conjecture; to speculate.]
(n) :
Alternative letter-case form of GISS. [(birdwatching) The general look of a bird.]