理路 is read as りろ (riro) and means logic.
りろ
riro
ろんりわかいろ
OR circuit
ろんりかいろ
logic device
ろんりひていかいろ
logical NOT circuit
だいおーどとらんじすたろんりかいろ
Diode-Transistor Logic
りろせいぜん
logical
ちょっけつけいとらんじすたろんりかいろ
Direct-coupled Transistor Logic
わけ
reason
りかい
sympathy
りねん
(Platonic) ideal (of how things ought to be, e.g. human rights)
りろん
theory
りそう
ideal
りか
science (as a school subject)