| BIPINNARIA | • bipinnaria n. (Zoology) The larva of certain starfishes as developed in the free-swimming stage. • BIPINNARIA n. the larva of certain starfishes as developed in the free-swimming stage. |
| PINNACLING | • pinnacling v. Present participle of pinnacle. • PINNACLE v. to equip with a pinnacle. |
| PINNATIFID | • pinnatifid adj. (Botany, of leaves) Having lobes with incisions that extend less than half-way toward the midrib. • PINNATIFID adj. of leaves, pinnately cut roughly halfway down. |
| PINNATIONS | • pinnations n. Plural of pinnation. • PINNATION n. the state of being pinnate. |
| PINNATIPED | • pinnatiped n. (Zoology) Any bird which has the toes bordered by membranes. • PINNATIPED adj. having the toes bordered by membranes; fin-footed, as certain birds. |
| PINNIPEDES | • pinnipedes n. Plural of pinnipede. • PINNIPEDE n. a member of the Pinnipeda, seals, walruses, and other such sea mammals, also PINNIPED. |
| PINNULATED | • pinnulated adj. (Zoology) Having pinnules. • PINNULATED adj. having each pinna subdivided, also PINNULATE. |
| SPINNAKERS | • spinnakers n. Plural of spinnaker. • SPINNAKER n. a large triangular sail opposite the mainsail. |
| SPINNERETS | • spinnerets n. Plural of spinneret. • SPINNERET n. the silk-spinning organ of an insect or spider, also SPINNERETTE. |
| SPINNERIES | • spinneries n. Plural of spinnery. • SPINNERY n. a spinning mill. |
| SPINNERULE | • spinnerule n. (Zoology) One of the numerous small spinning tubes on the spinnerets of spiders. • SPINNERULE n. one of the numerous small spinning tubes on the spinnerets of spiders. |
| TENPINNERS | • tenpinners n. Plural of tenpinner. • TENPINNER n. one who engages in tenpin bowling. |
| TRIPINNATE | • tripinnate adj. (Botany) Having bipinnate leaflets arranged on each side of a rhachis. • TRIPINNATE adj. three times pinnate. |