No definitions found for 'phototube'
Perhaps one of these:
potato beetle,
petitio principii,
pitot tube,
potato fern,
petit bourgeois,
putative,
phototopographical,
potato peel,
potato blight,
potato bug,
potato fly,
potato peelings,
potato weevil,
phototopography,
potato family,
phototopographic,
petit four,
phototypy,
put out feelers,
putative marriag,
phototypic,
phototypography,
potato fungus,
putative father,
pate de foie gras,
potato bean,
petit point,
petite bourgeoisie,
potato vine,
pedatifid,
potato pancake,
phototype