terce-, ter- +

(Latin: third, thrice)

terce
In the Roman Catholic Church, the third of the seven separate canonical hours that are set aside for prayer each day.
tercel
1. A male hawk; especially, male peregrine or gyrfalcon.
2. Etymology: "male falcon"; from Old French tercel (c.1200), from Middle Latin tertiolus, from Latin tertius, "third".

There are various theories as to why it is called this; one says it's because the males are a third smaller than the females; another because a third egg in the nest (smaller than the other two) is believed always to produce a male bird.

tercentenary
1. A year, or an exact day, 300 years after an event, usually one of special historic significance.
2. Coinciding with the 300th anniversary of an event, and often celebrating or commemorating the event.
tercentennial
1. A 300th anniversary or its celebration.
2. The three-hundredth anniversary of an event; tricentennial. 2006 was the tercentennial of Benajmin Franklin's birth.
tercet
A group of three lines of verse that rhyme with each other or with another group of three.
tierce
1. A sequence of three cards of the same suit.
2. The third of eight positions from which a fencing parry can be made.
3. A former measure of capacity equal to (42 wine gallons).
4. Etymology: from Old French, from Latin tertia, feminine of tertius, "a third"; from base of tres, "three".

Cross references of word families that are related, partially or totally, to: "three, third": terti-; tri-, tre; trigono-; trito-.