Pu·tu·ma·yo 
(p′tə-mīō, -t-mäyō)
(p′tə-mīō, -t-mäyō) A river of northwest South America rising in southwest Colombia and flowing about 1,610 km (1,000 mi) along the Colombia-Peru border to the Amazon River in northwest Brazil.
- retrofitter
- retroflection
- retroflex
- retroflexion
- retrogradation
- retrograde
- retrograde ejaculation
- retrogradely
- retrogress
- retrogression
- retrogressive
- retrogressively
- retrolental
- retronym
- retroocular
- retroperitoneal
- retropharyngeal
- retrorocket
- retrorse
- retrorsely
- retrospect
- retrospection
- retrospective
- retrospectively
- retrotransposon