def isWord(wordList, word):
    """
    Determines if word is a valid word.

    wordList: list of words in the dictionary.
    word: a possible word.
    returns True if word is in wordList.

    Example:
    >>> isWord(wordList, 'bat') returns
    True
    >>> isWord(wordList, 'asdf') returns
    False
    """
    word = word.lower()
    word = word.strip(" !@#$%^&*()-_+={}[]|\\:;'<>?,./\"")
    return word in wordList