- AkronA city, the county seat of Summit County, Ohio.
- acronymGenerally such abbreviations, including those pronounced as individual letters (initialisms such as "TNT").
- acromegalyA chronic disease marked by enlargement of the bones of the extremities, face, and jaw that is caused by over-activity of the pituitary gland.
- acronemeThe slender section of a flagellum
- acropetalThat develops, matures or opens from the base towards the apex in sequence.
- akroposthionThe tip of the foreskin which extends beyond the glans.