tri·plane 
(trīplān′)
(trīplān′)n.
An airplane with wings placed above each other in three levels.
triplanec. 1916 Sopwith Triplane N500
- specialty
- speciate
- speciation
- speciational
- specie
- species
- speciesism
- speciesist
- species-specific
- species-specificity
- specifiable
- specific
- specifically
- specification
- specific epithet
- specific gravity
- specific heat
- specific humidity
- specific impulse
- specificity
- specific performance
- specific resistance
- specific thrust
- specifier
- specify