| alyssum |
any of a group of weedy low-growing plants of the mustard family, having tiny white or yellow four-petaled flowers borne on branched stalks. [1/2 definitions] |
| amoeba |
a tiny living thing made of only one cell. Amoebas move by changing their shape. They eat by wrapping their bodies around their food. Amoebas live in fresh and salt water, soil, and in animals. Most kinds of amoebas can only be seen through a microscope. |
| amphioxus |
a tiny fishlike marine organism characterized by a primitive vertebra and dorsal nerve tissue; lancelet. |
| animalcule |
a tiny or microscopic creature. |
| asteroid |
a small, rocky, planet-like body that circles the sun and is mostly found between the orbits of Jupiter and Mars. The size of an asteroid can vary from very tiny to six hundred miles across. |
| atom |
anything extremely small; tiny bit. [1/2 definitions] |
| atomic |
extremely tiny. [1/3 definitions] |
| bacterium |
singular form of "bacteria." Bacteria are tiny living things made up of one cell each. Bacteria live in most living things and in all parts of the earth. Most bacteria are useful to people, but some are harmful because they can cause disease. |
| beauty spot |
a tiny dark mark or patch applied to the face or shoulders, esp. by a woman to accentuate the fairness of her skin. [1/2 definitions] |
| biting midge |
any of several tiny two-winged biting insects, similar to gnats, that attack in swarms. |
| breadcrumb |
a very tiny bit of bread. [1/2 definitions] |
| bug |
(informal) a tiny microphone hidden for the purpose of listening to and recording voices secretly. [1/6 definitions] |
| calla |
any of several subtropical plants, esp. the calla lily, which has a large, white petal-like part surrounding a yellow spike of tiny flowers. [1/2 definitions] |
| canaliculus |
a small bodily channel or tubular passage, such as a tear duct, or a tiny groove, as in a bone. |
| cap1 |
a tiny explosive charge, usu. contained in paper, for use in a toy pistol. [1/10 definitions] |
| capillary |
a tiny blood vessel joining the end of an artery to the beginning of a vein. |
| capsule |
a tiny case that holds one dose of medicine. Capsules are made of gelatin and dissolve when swallowed. [1/2 definitions] |
| cattail |
any of several tall, reedlike marsh plants with tiny brown flowers growing in dense rows on a cylindrical spike. |
| cell |
a tiny unit of plant or animal life, having a nucleus and surrounded by a very thin membrane. [1/4 definitions] |
| chalk |
a soft, white limestone that comes mostly from tiny sea shells. [1/3 definitions] |
| chigger |
the tiny larva of a mite that lives in the skin of animals and causes great itching. It is usually not dangerous but can sometimes spread disease. |