A muscle, especially the one at the front of the upper arm.
What is biceps?
100
A closed plane figure having three sides and three angles.
What is triangle?
200
A single tone without harmony or variation in pitch.
What is monotone?
200
Occurring or lasting every two years
What is biennial?
200
One of three children or offspring born at the same birth.
What is triplets?
300
Knowing or able to use only one language
What is monolingual?
300
To cut or divide into two equal or nearly equal parts
What is bisect?
300
An athletic contest comprising three consecutive events, usually swimming, bicycling, and distance running
What is a triathlon?
400
A part of a drama in which a single actor speaks alone
What is monologue?
400
Consisting of, indicating, or involving two
What is binary?
400
Pertaining to 300 years or a period of 300 years
What is tricentennial?
500
Wearisome uniformity or lack of variety, as in occupation or scenery
What is monotony?
500
Having two branches, chambers, or houses, as a legislative body
What is bicameral?
500
The branch of mathematics that deals with the relations between the sides and angles of plane or spherical triangles, and the calculations based on them