- aldehyde mutase
- aldehyde oxidase
- aldicarb
- aldohexose
- aldolase
- aldopentose
- aldose
- aldosterone
- aldotetrose
- aldotriose
- aldoxime
- aldrin
- alecithal
- alecithal egg
- aletocyte
- aleucemia
- aleukemia
- aleurolite
- aleurone
- aleurone grain
- aleurone layer
- alexandrian clover
- alexia
- alexin
- alfalfa
- alfisol
- algae
- algeny
- algin
- alginic acid
- algology
- alimentary anemia of piglet
- alimentary canal
- alimentary canal of silkworm
- alimentary tract
- alkali
- alkali metal
- alkali treatment
- alkalimeter
- alkaline earth metal
- alkaline feed
- alkaline soil
- alkaline treatment of feed
- alkalinity
- alkalinization
- alkaloid
- alkalosis
- alkaptonuria
- alkekengy
- all in all out