coun·ter·ar·gu·ment 
(kountər-är′gyə-mənt)
(kountər-är′gyə-mənt)n.
1. An argument in opposition to another.
2. Something that undermines an argument or deters someone from action: The large number of police provided a powerful counterargument to riotous behavior.
- hypothetical
- hypothetical imperative
- hypothetically
- hypothyroid
- hypothyroidism
- hypotonic
- hypotonicity
- hypotrophic
- hypotrophy
- hypoventilation
- hypoxanthine
- hypoxemia
- hypoxia
- hypoxic
- hyps-
- hypso-
- hypsographic
- hypsographical
- hypsography
- hypsometer
- hypsometric
- hypsometrical
- hypsometrically
- hypsometrist
- hypsometry