古き is read as ふるき (furuki) and means old.
ふるき
furuki
ふるほん
secondhand book
こだい
ancient times
ここん
ancient and modern times
ふるい
of the distant past
こもんじょ
pre-Meiji era document addressed to someone in particular
ふるもの
antique
こぼく
old tree
こふう
old-fashioned
こご
old language
こぶん
ancient Chinese character (pre-Qin period)
こしょ
いにしえ
antiquity