Mōtung:Bises

Where is word "hlēapgēar/hlīepgēar"

I have seen "hlēapgēar/hlīepgēar" used to mean "leapyear" a lot on this wiki, but I am unable to find it in BT. Is anyone able to direct me to where this word is to be found in OE texts? If not, I think it is appropriate to change all instances of "hlīepgēar" to "bises/bissexte".   Ƿes hāl!    22:44, 20 Wēodmōnaþ 2014 (UTC)