tic-tac 
(tĭktăk′)
(tĭktăk′)n.
Variant of ticktack.
- hypothenuse
- hypothenuse
- hypothermal
- hypothermia
- hypothermic
- hypothesis
- hypothesize
- hypothetical
- hypothetical imperative
- hypothetically
- hypothyroid
- hypothyroidism
- hypotonic
- hypotonicity
- hypotrophic
- hypotrophy
- hypoventilation
- hypoxanthine
- hypoxemia
- hypoxia
- hypoxic
- hyps-
- hypso-
- hypsographic
- hypsographical