Two or more syllables together to form the smallest unit of rhythm in a poem. An iamb, for example, is a foot with two syllables, one unstressed and one stressed. An anapest has three syllables, two of which are unstressed and one of which is stressed. The pattern continues: an amphimacer has one unstressed syllable and one stressed, and so on. A hemistich is a pair of lines consisting of an equal number of words, usually five or seven. In a pentameter line, the two hemistichs are of unequal length. The first may be longer by up to half a line because it can end with a word that the second cannot begin with. The last word of the first hemistich is called the caesura. Between the fifth and sixth feet of a dactylic hexameter line there is also a slight pause that does not count as a foot. A spondee is a foot composed of two long syllables; thus, "ham" is a spondaic line. A monospondeic line is one with only one long syllable; thus, "aime" is a monospondeic line. A polyspondaic line is one with more than two long syllables; thus, "Zeus" is a polyspondaic line.