During Lent what is known as not eating meat?

On Fridays, Catholics over the age of 14 are not supposed to any kind of meat. Fish is okay however and many churches have "seafood dinners" on the Fridays during Lent.

Abstaining. During Lent, one must abstain from meat on Ash Wednesday. The Church's rules require abstainingfrom meat on all Fridays of the year. Some countries have an indult where you may abstain from something else on Fridays outside of Lent although meat is still recommended, for a complete discussion of the current rules, read Pope Paul VI's regulations which are still in effect, at the link below.