適す is read as てきす (tekisu) and means to fit.
てきす
tekisu
てきとう
suitable
てきよう
applying (e.g. a technology)
てきせつ
appropriate
てきど
moderate (degree)
てきせい
aptitude
てきかく
eligible
てきする
to fit
てきじ
timely
reasonable
てきほう
legal
てきごう
conformity
てきにん
competent