Is Herbarium Singular or Plural?

The plural form of herbarium is herbariums or herbaria.

What is the plural of herbarium?

noun. her·​bar·​i·​um | \ ˌ(h)ər-ˈber-ē-əm \ plural herbaria\ ˌ(h)ər-​ˈber-​ē-​ə \

Is Herbarium a noun?

noun, plural her·bar·i·ums, her·bar·i·a [hur-bair-ee-uh]. a collection of dried plants systematically arranged. a room or building in which such a collection is kept.