tutelary

also tu·te·lar (tūt'l-ər, -är', tyūt'-)
adj.

1. Being or serving as a guardian or protector: tutelary gods.
2. Of or relating to a guardian or guardianship.

n., pl., -lar·ies, also -lars.
One that serves as a guardian or protector.

[From Latin tūtēlārius, guardian, from tūtēla, tutelage. See tutelage.]

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The adjective has one meaning:

Meaning #1: providing protective supervision; watching over or safeguarding
  Synonyms: custodial, guardian, tutelar

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