/ ˈsɒmnələnt; NAmE ˈsɑːm-/ adjective ( formal )
1.
almost asleep :
a somnolent cat
( figurative )
a somnolent town
2.
making you feel tired :
a somnolent Sunday afternoon
► som·no·lence noun [ U ]
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WORD ORIGIN
late Middle English (in the sense causing sleepiness ): from Old French sompnolent or Latin somnolentus , from somnus sleep.