| poison pill | the target company defends itself by making its stock less attractive to an acquirer |
| South American poison toad | a South American toad |
| catalytic converter | a converter that uses a platinum-iridium catalyst to oxidize pollutants and carbon monoxide into carbon dioxide and water, an antipollution device on an automotive exhaust system |
catalytic cracker
cat cracker | a chemical reactor for converting oils with high boiling points into fuels with lower boiling points in the presence of a catalyst |
| poison | anything that harms or destroys, the poison of fascism |
| catalyst | something that causes an important event to happen, the invasion acted as a catalyst to unite the country |
darling pea
poison bush | either of two Australian plants of the genus Swainsona that are poisonous to sheep |
winter sweet poison arrow plant
Acocanthera oblongifolia
Acocanthera spectabilis | medium-sized shrubby tree of South Africa having thick leathery evergreen leaves and white or pink flowers and globose usually two-seeded purplish black fruits |
bushman's poison
ordeal tree
Acocanthera oppositifolia
Acocanthera venenata | evergreen shrub or tree of South Africa |
fly poison
Amianthum muscaetoxicum
Amianthum muscitoxicum | all parts of plant are highly toxic, bulb pounded and used as a fly poison, sometimes placed in subfamily Melanthiaceae |
poison camas
Zigadenus nuttalli | a common perennial death camas, Tennessee to Kansas to Texas |
| poison bush poison pea gastrolobium | any of various Australian evergreen shrubs of the genus Gastrolobium having whorled compound leaves poisonous to livestock and showy yellow to deep reddish-orange flowers followed by two-seeded pods |
poison ash
poison dogwood
poison sumac
Toxicodendron vernix
Rhus vernix | smooth American swamp shrub with pinnate leaves and greenish flowers followed by greenish white berries, yields an irritating oil |
poison ivy
markweed
poison mercury
poison oak Toxicodendron radicans
Rhus radicans | climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries, yields an irritating oil that causes a rash on contact |
western poison oak
Toxicodendron diversilobum
Rhus diversiloba | poisonous shrub of the Pacific coast of North America that causes a rash on contact |
eastern poison oak
Toxicodendron quercifolium
Rhus quercifolia
Rhus toxicodenedron | poisonous shrub of southeastern United States causing a rash on contact |
black nightshade
common nightshade
poisonberry
poison-berry
Solanum nigrum | Eurasian herb naturalized in America having white flowers and poisonous hairy foliage and bearing black berries that are sometimes poisonous but sometimes edible |
hemlock poison hemlock
poison parsley
California fern
Nebraska fern
winter fern
Conium maculatum | large branching biennial herb native to Eurasia and Africa and adventive in North America having large fernlike leaves and white flowers, usually found in damp habitats, all parts extremely poisonous |
poison milkweed
horsetail milkweed
Asclepias subverticillata | milkweed of southwestern United States and Mexico, poisonous to livestock |
| poison ivy | dermatitis resulting from contact with the poison ivy plant, my poison ivy is drying up |
| poison oak | dermatitis resulting from contact with a poison oak plant |
| poison sumac | dermatitis resulting from contact with a poison sumac plant |
catalyst
accelerator | (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected |
| poison gas | a gas that is poisonous to breath or contact, used in chemical warfare |
poison
toxicant
poisonous substance | any substance that causes injury or illness or death of a living organism |
| poison | administer poison to, She poisoned her husband but he did not die |
poison
envenom | add poison to, Her husband poisoned her drink in order to kill her |
| poison | kill with poison, She poisoned her husband |
| poison | kill by its poison, This mushrooms can poison |
| poison | spoil as if by poison, poison someone's mind, poison the atmosphere in the office |
| catalytic | relating to or causing or involving catalysis, catalytic reactions |