Webster's Revised Unabridged Dictionary · 1913

Mâtin

Mâtin , noun

[French mâtin.]

(Zoology) A French mastiff.

Also: Matin

Matin , noun

[French from Latin matutinum the morning, matutinus of the morning, Matuta the goddess of the morning. See Matutinal.]

1.
Morning. [Obsolete] — Shakespeare
2.
Morning worship or service; morning prayers or songs.
The winged choristers began To chirp their matins. — Cleveland
3.
Time of morning service; the first canonical hour in the Roman Catholic Church.

matin , adjective

Of or pertaining to the morning, or to matins; used in the morning; matutinal.