Correct spelling for the English word "hillar" is [hˈɪlə], [hˈɪlə], [h_ˈɪ_l_ə] (IPA phonetic alphabet).
"Hillar" is not a recognized word in the English language. It does not have an entry in any reputable dictionaries and no widely accepted definition exists.
In some cases, a word may not be recognized due to being misspelled or an error in transcription. It is possible that the intended word could be "hilar," which does have a meaning in specific contexts. In anatomy, the term "hilar" refers to the area near the hilum, which is a depression or slit-like opening on an organ, usually associated with blood vessels and nerves. For example, the hilar region of the lungs is located near the bronchi and blood vessels.
However, if "hillar" was intended to be a unique term or a neologism, it is important to note that without further context or information, it is challenging to provide a definition. Developing a dictionary entry requires sufficient evidence of usage, typically found in published literature, popular culture, or common discourse. If "hillar" is a newly coined word or a personal term, it would be best to clarify its intended meaning or provide additional details to better understand its definition.