a·leph-null 
(ä′lĕf-nŭl, -ləf-)
(ä′lĕf-nŭl, -ləf-)n.
The first of the transfinite cardinal numbers. It corresponds to the number of elements in the set of positive integers. Also called aleph-zero.
- phosphorylase
- phosphorylate
- phosphorylation
- phosphorylative
- phot
- phot-
- phot-
- photic
- photo
- photo-
- photoactive
- photoactivity
- photoaged
- photoaging
- photoautotroph
- photoautotrophic
- photoautotrophically
- photobiologic
- photobiological
- photobiology
- photobomb
- photocell
- photochemical
- photochemically
- photochemical smog