appendicectomy/əˌpendiʹsektəmi/ appendectomy /apənʹdek-/ noun (pl -ies) (pl appendicectomies appendectomies)

• at one's earliest convenience
• at one's fingertips
• at one's worst
• atonic
• at/on sight
• atony
• atop
• atopy
• -ator
• -atory
• a tough/hard nut (to crack)
• ATP
• at peace
• at present
• atrabilious
• at random
• atrazine
• a treat
• atresia
• at rest
• a trifle
• at right angles
• a trip/walk down memory lane
• at risk
• atrium