The pronuciation guide here uses the International Phonetic Alphabet.

rob·o·rant /ˈrɒbərənt/
Medicine/Medical

adjective
1. strengthening. 
noun
2. a tonic. 

[Origin: 1655–65; < L rōborant– (s. of rōborāns), prp. of rōborāre to strengthen, equiv. to rōbor– (s. of rōbur) oak, hardness + -ant- -ant]

Source: Dictionary.com.

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