Kybp is likely misspelled.
Kybp has no English definition.
As a noun kiloyear
is a millennium, a period of one thousand years.
kiloyear
English
Noun
(
en noun)
(geology, science fiction) A millennium, a period of one thousand years.
Synonyms
* See
Related terms
* megayear, mega-annum
* gigayear, gigannum kybp
English
===(
en)===
(
en-initialism)
kiloyears before present; thousands of years before present.