Thimbleful
/ˈθɪmblfʊl/
Definition 1 of 2
Pro Tip 1/3Visualize Amount
Picture a small sewing thimble to gauge how much 'thimbleful' represents when considering amount. 
I added just a thimbleful of oil to the dressing.
Pro Tip 2/3Not for Precision
'Thimbleful' implies an approximate amount, not meant for recipes or situations requiring precision. 
Just use a thimbleful of vanilla extract; the exact measure isn't crucial.
Pro Tip 3/3Often Figurative
While it can refer to literal amounts, 'thimbleful' is frequently used in a figurative sense for liquids. 
Each guest received a thimbleful of the rare wine to taste. Compare with
DabDashDropModicumParticlePinchSpeckTrace
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