What is the work for hello in Celtic?

There's no single word for "hello" in Celtic languages. Celtic is a broad family of languages, and each has its own unique greeting. Here are some examples:

Gaelic (Irish, Scottish Gaelic):

* "Dia dhuit" (pronounced "dee-a gwit") - "God be with you." This is the most formal greeting.

* "Dia is Muire dhuit" (pronounced "dee-a is moo-ree gwit") - "God and Mary be with you." Another formal greeting.

* "A Dhia" (pronounced "ah dee-a") - "Oh God." This is a more informal greeting.

* "Cead mile failte" (pronounced "kayd mil-ya fahl-cha") - "A hundred thousand welcomes." This is a welcoming phrase used especially for visitors.

Welsh:

* "Helo" - This is the most common greeting, borrowed from English.

* "Bore da" (pronounced "boreh dah") - "Good morning."

* "Prynhawn da" (pronounced "prihn-houn dah") - "Good afternoon."

* "Nos da" (pronounced "nos dah") - "Good evening."

Breton:

* "Degemer mat" (pronounced "de-guh-mer maht") - "Welcome."

* "Salud" (pronounced "sa-lood") - "Hello." Borrowed from Spanish.

It's important to note that the specific word or phrase used will depend on the specific language and context.