| A | B |
|---|
| biceps | large muscle in the upper arm |
| biennial | every two years |
| bifocals | eyeglasses that correct far away and close up vision |
| bihourly | every two hours |
| bilateral | having to do with two sides |
| bilingual | speaking two languages |
| bimetallic | having two kinds of metal |
| binary | having two parts |
| binoculars | an optical instrument for use with both eyes |
| bipartisan | having to do with two parties |
| biplane | a plane having a set ot parallel wings |
| bisected | divided into two parts |
| triad | a group of three |
| triangle | a relation between three people in which two people are in love with a third |
| tricuspid | having three points or cusps, as a molar |
| trident | a long, three-pointed fork or spear |
| trilogy | three separate books or stories which make up a longer tale |
| trio | a musical composition written for three performers |
| triplicate | having three exact copies |
| trivet | a metal stand usually with three short feet, for use under hot dishes |
