tri·hy·brid 
(trī-hībrĭd)
(trī-hībrĭd)n.
The hybrid of parents that differ at only three gene loci, for which each parent is homozygous.
- photoengraving
- photo-essay
- photo essay
- photo-essayist
- photo finish
- photoflash
- photoflood
- photofluorogram
- photofluorographic
- photofluorography
- photog
- photogelatin process
- photogene
- photogenic
- photogenically
- photogram
- photogrammetric
- photogrammetrist
- photogrammetry
- photograph
- photographable
- photographer
- photographic
- photographical
- photographically