Is (root: is)

• POS: Noun, Verb (usu participle)
• HYPHEN: I=s

CIDE DICTIONARY

Is, v. i. [AS. is; akin to G. & Goth. ist, L. est, Gr. , Skr. asti. Am, Entity, Essence, Absent.].

 The third person singular of the substantive verb be, in the indicative mood, present tense; as, he is; he is a man. See Be.  [1913 Webster]
" In some varieties of the Northern dialect of Old English, is was used for all persons of the singular."  [1913 Webster]
" The idiom of using the present for future events sure to happen is a relic of Old English in which the present and future had the same form; as, this year Christmas is on Friday."  [1913 Webster]
"For thy is I come, and eke Alain."  [1913 Webster]
"Aye is thou merry."  [1913 Webster]
"To-morrow is the new moon."

OXFORD DICTIONARY

Is, 3rd sing. present of BE.