the bottom or lower surface
WordReference Random House Learner's Dictionary of American English © 2025
WordReference Random House Unabridged Dictionary of American English © 2025
un•der•side
(un′dər sīd′),USA pronunciation n.
- an under or lower side.
- under- + side1 1670–80
Collins Concise English Dictionary © HarperCollins Publishers::
'underside' also found in these entries (note: many are not synonyms or translations):
California gold fern
- Indian jujube
- aftershaft
- agaric
- agaricaceous
- air dam
- auto lift
- bed
- beefsteak begonia
- belly
- bird's mouth
- black huckleberry
- black widow
- blue whale
- boletus
- bottom
- bridge fluting
- bulb
- butterfly table
- center plate
- ceramic hob
- chain stitch
- cicada
- clamshell door
- comma
- compass card
- drag
- fern
- fish-bellied
- flat bug
- flicker
- float
- frenum
- gill
- hanging wall
- hopper
- horseshoe
- hypoglottis
- iceblink
- karo
- larry car
- midshipman
- misericord
- mortarboard
- nut
- pad
- pileus
- plafond
- question mark
- rainbow snake