hy·dro·scope 
(hīdrə-skōp′)
(hīdrə-skōp′)n.
An optical device used for viewing objects far below the surface of water.
hy′dro·scopic (-skŏpĭk) adj.
- predictive
- predictively
- predictor
- predigest
- predigestion
- predilection
- predispose
- predisposition
- prednisolone
- prednisone
- predoctoral
- predominance
- predominancy
- predominant
- predominantly
- predominate
- predominately
- predomination
- predominator
- preeclampsia
- preeclamptic
- pre-embryo
- pre-embryonic
- preemie
- preeminence