The period of the winter solstice, about December 22.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "midwinter" in a sentence
"I recall her coming in midwinter from the frozen village where she lived."
"Between the flak, the searchlights, the night fighters and the freezing, airless cold at twenty-thousand feet, bombing Germany in midwinter is no joke at all - but with some of the friends he’s got, pilot Ken Harding might not even need any enemies."
"The year turns and does not know what to be, hovers in midwinter waiting for someone to show it how to bud and break forth into colour and life once more."