Source : Webster's Revised Unabridged Dictionary (1913)

Guava \Gua"va\, n. [Sp. guayaba the guava fruit, guayabo the
   guava tree; prob. fr. the native West Indian name.]
   A tropical tree, or its fruit, of the genus {Psidium.} Two
   varieties are well known, the {P. pyriferum}, or {white
   guava}, and {P. pomiferum}, or {red guava}. The fruit or
   berry is shaped like a pomegranate, but is much smaller. It
   is somewhat astringent, but makes a delicious jelly.

Source : WordNet®

guava
     n 1: small tropical shrubby tree bearing small yellowish fruit
          [syn: {strawberry guava}, {yellow cattley guava}, {Psidium
          littorale}]
     2: small tropical American shrubby tree; widely cultivated in
        warm regions for its sweet globular yellow fruit [syn: {true
        guava}, {guava bush}, {Psidium guajava}]
     3: tropical fruit having yellow skin and pink pulp; eaten fresh
        or used for e.g. jellies