Answer: The meaning of the word "countenance" as it is used in the passage provided is d. "noun: facial expression".
Step-by-step explanation: In this passage from "The Raven", the word "countenance" has been used as a noun as it is identifying a thing rather than denoting an action. Moreover, it has been premodified by the determiner "the". As regards its meaning, "countenance" refers to the appearance or the expression in the face of a person/animal. Therefore, the option that provides the correct meaning is D. noun: facial expression.