plural pros
1
: an argument or evidence in affirmation
an appraisal of the pros and cons
2
: the affirmative side or one holding it
: on the affirmative side : in affirmation
much has been written pro and con
: in favor of : for
public relations officer
1
a
: earlier than : prior to : before
prothalamion
b
: rudimentary : prot-
pronucleus
c
: precursory
proinsulin
2
a
: located in front of or at the front of : anterior to
procephalic
b
: front : anterior
prothorax
3
: projecting
prognathous
1
: taking the place of : substituting for
procathedral
procaine
2
: favoring : supporting : championing
pro-American
Cite this Entry
“Pro.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pro. Accessed 6 Aug. 2026.
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