WordReference Random House Unabridged Dictionary of American English © 2026
um
(um, un, əm, ən),USA pronunciation interj.
- (used as an expression of doubt, hesitation, deliberation, interest, etc.)
'um' also found in these entries (note: many are not synonyms or translations):
basidiomycete
- cisplatin
- -ium
- platinum
- umlaut
- acetabulum
- aceto-
- acoelous
- adverb
- adverbial
- aeciospore
- age
- ajuga
- allethrin
- alliaceous
- allodial
- alluvial
- Alum Rock
- ambi-
- amidin
- ammonia alum
- ammonium alum
- ammonium chrome alum
- animadvert
- antediluvian
- anthophyllite
- apiaceous
- apocynaceous
- appoggiatura
- appreciate
- arcanist
- argentiferous
- argento-
- aroid
- arrow arum
- arum family
- arum lily
- ary
- ascidian
- asphalt
- athenaeum
- -atory
- auramine
- aureate
- auri-
- auric
- auspicial
- auspicious
- auxiliary
- baculiform