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Adjective
Having
a
single
trema
,
or
aperture
.
Noun
A
mammal
that
lays
eggs
and
has
a
single
urogenital
and
digestive
orifice
.
Only
the
echidnas
and
platypuses
are
included
in
this
group
.
Made with ♥ by Homo Sapiens on Planet Earth

Rejected by Y-Combinator. Definitions by Wiktionary.

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