We don't have synonyms for underprint yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are underpin, underprice and underpoint.
(adj) :
(printing) The addition of colour under black areas to produce a deeper black and prevent oversaturation of the paper.
(n) :
(philately) Printing underneath the main design of a stamp, intended to prevent forgery or removal of the postmark.
(n) :
(philately, considered incorrect usage) a logo or advertising printed on the underside of a stamp; backprint.
(n) :
(geology) A fossilised print in the rock bed that is at a deeper level than the track the creature leaving it was actually travelling on; caused by the pressure of a heavy animal or penetration of the sediment by a pointed appendage.
(adj) :
(printing) The addition of colour under black areas to produce a deeper black and prevent oversaturation of the paper.
(n) :
(philately) Printing underneath the main design of a stamp, intended to prevent forgery or removal of the postmark.
(n) :
(philately, considered incorrect usage) a logo or advertising printed on the underside of a stamp; backprint.
(n) :
(geology) A fossilised print in the rock bed that is at a deeper level than the track the creature leaving it was actually travelling on; caused by the pressure of a heavy animal or penetration of the sediment by a pointed appendage.