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What's the meaning of 'twins' in English?

Hi! I write stories but I'm not an English native speaker and I have a doubt with this term.

I am not sure if in English there is another way to call them, in Spanish we say “mellizos” for those siblings that born when two different spermatozoon’s fertilizes two different ovum’s, of course they born the same day in the same childbirth, but they can be a girl and a boy, or two boys or two girls, they look very very similar, but not identical. One of them can have blue eyes and the other one green eyes.

And we say “gemelos” for those brothers or sisters that born when two different spermatozoon’s fertilizes THE SAME ovum, so they're identical, they only can be two boys or two girls, same eye-color, same hair-color.

In my story, my characters are "mellizos" how do you say that? Or you say twins in both cases?

Help please!
SW-User
They are called fraternal twins if they are not identical.
whowasthatmaskedman · 70-79, M
In English, both are twins. But the pair that look alike from a single split egg are defined as "Identical." While those from separate eggs are less commonly referred to as "fraternal."
4meAndyou · F
Twins in both cases is acceptable, but you can add detail. We do differentiate. If the are mellizos we say "Fraternal Twins". If they are gamelos we say "Identical twins"
Nayla · 51-55, F
mellizos = fraternal twins
gemelos = identical twins
AndyC · 22-25, F
Thank you very much, to everyone!
walabby · 61-69, M
... then there is a rare type of twin when the ovum splits BEFORE being fertilized, and the two identical ovum are fertilized by different sperm. These are half identical twins and can be boy boy, girl girl, or girl boy.....
indyjoe · 56-60, M
Fraternal twins and identical twins...fraternal meaning boy/girl. boy/boy, girl/girl that are not identical.
DragonFruit · 61-69, M
We say “twins” where you’d say “mellizos”.
We call it “identical twins” where you’d call it “gemelos"
SW-User
I don't think there is a different word in English - we use twins for both.
Northerner · 70-79, M
They are twins. twin boys or twin girls. or one boy one girl they are still twins.
Both are “twins” in English but
Mellizos would be [b]fraternal[/b] twins and
gemelos would be [b]identical[/b] twins.
CharlieZ · 70-79, M

 
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