甲

armored corps; armoured corps

worth mentioning

amber (colour, color)

all-A (student)

cold northerly winter wind from the Rokko Mountains

armor made from small iron plates bound by leather cords (from Kofun to Nara periods)

armored cruiser

Anatomy

parathyroid (glands); accessory thyroid glands

black longspine urchin (Diadema setosum)

promenade deck

article of tortoise shell; tortoiseshell work

Godan verb with 'ru' ending (irregular verb)

to be worth the effort; to be worth the trouble

cuttlebone

kisslip cuttlefish (Sepia lycidas)

common cuttlefish (Sepia officinalis)

Proverb

to each their own; different strokes for different folks; cut your coat to suit your cloth; a crab digs a hole like its own shell

gun deck (ship)

main deck

armored recovery vehicle; armoured recovery vehicle

armored personnel carrier; armoured personnel carrier

hexagonal pattern

shoulder girdle

Physiology

parathyroid hormone; parathormone

oracle bone script

pteraspids (extinct armoured jawless fishes)