Living beings on Earth

[Sergio Nova]

Some time ago, someone posted something somewhere on this forum using a word that defines all the animal lives existing on Earth as having two sides, the right side being a sort of reflex of the left side. I cannot remember the word and I was unable to find it, but I need it urgently for a text I have been writing. Would someone help me?

[^Ripper]

Pissarro: Life with nonlife… plant and animal… intelligence and strength…
Pissarro: That is a complete amalgamation of virtues!!

http://forum.rippersanime.info/viewtopi ... side#p6877

This?

Also welcome back?
Vacation done?

[Sergio Nova]

1. No. It is a technical word (probably an adjective) defining the physical form of ALL forms of life on Earth (and, as far as we have seen, as well on Venus, Jupiter and Mars), having two equivalent sides.
2. I was not on vacation, but working. Anyway, I am back to civilization and to the chaotic big city (and, man, I do love the chaos).

[^Ripper]

I've thrown every keyword i could think of into the search, but cannot find anything else.
So i googled.

http://en.wikipedia.org/wiki/Life
http://en.wikipedia.org/wiki/Symmetry_%28biology%29
http://en.wikipedia.org/wiki/Bilateria

Hylomorphism?
More fancy words to be found on that page

Still i cannot find exactly the wording you gave me.

[Sergio Nova]

Well, I put your research in Collins Dictionary and, voilà, I found bilateral symmetry (noun, the property of an organism or part of an organism such that, if cut in only one plane, the two cut halves are mirror images of each other).

Strangely, I could not find it here, anyway. That said, either I am senile and confusing things (but where else would I have changed ideas about such a subject?) or someone confused the terminology.

Anyway, you helped a lot. Thanks for your attention.