Thank you for sharing your thoughts with us.
If you are troubled or distressed by what happened to you or what you witnessed in your childhood, you should just go ahead and share the details with your therapist. There is really no need to withhold such information from your therapist. Rest assured that what you say will not shock or harm your therapist. Most therapists would have heard of even more shocking stories.
Sometimes, it is really important to take into consideration what an 'outsider' or third party (someone who is not involved in the event or encounter) say as he/she is more likely to be objective.
As to what you experience constitute abuse or what, it may be important to consider two aspects: 1. the original intention of the care giver; 2. the trauma that you experience.
In general, many clinicians would agree that neglect constitutes a form of child abuse.
I hope that you will be able to obtain closure to the event. Do take good care of yourself.