Custos \Cus"tos\ (k[u^]s"t[o^]s), n.; pl. Custodes (k[u^]s*t[=o]"d[=e]z). [L.]

A keeper; a custodian; a superintendent. [Obs.]

Custos rotulorum (r[o^]t`[-u]*l[=o]"r[u^]m) [LL., keeper of the rolls] (Eng. Law), the principal justice of the peace in a county, who is also keeper of the rolls and records of the sessions of the peace.

Source: Webster's Revised Unabridged Dictionary (1913)