余割 is read as よかつ (yokatsu) and means cosecant.
よかつ
yokatsu
あまり
(not) very
よち
place
よけい
all the more
よじん
others
あまりに
too (much)
あまる
to remain
よぶん
extra
あます
to save
よだん
digression
よそ
another place
よりょく
money to spare
よほど
just about to