| DIOPTRIC | • dioptric adj. Acting as a medium for sight; making use of refraction (Of lenses, etc.). • dioptric adj. (Obsolete) Pertaining to a diopter. • dioptric adj. (Obsolete) Capable of being seen through. |
| DIPROTIC | • diprotic adj. (Chemistry, of an acid or base) Tending to donate or accept two hydrogen ions (H+) in solution. • DIPROTIC adj. (of an acid) having two transferable protons. |
| DIPTEROI | • dipteroi n. Plural of dipteros. • DIPTEROS n. (Greek) a building with two colonnades. |
| DISPIRIT | • dispirit v. (Transitive) To lower the morale of; to make despondent; to dishearten. • DISPIRIT v. to lower in spirits. |
| DRIFTPIN | • driftpin n. (Engineering) A smooth drift. • DRIFTPIN n. a metal pin for securing timbers. |
| INTREPID | • intrepid adj. Fearless; bold; brave. • INTREPID adj. fearless. |
| PITYROID | • pityroid adj. Having the form of, or resembling, bran. • PITYROID adj. bran-like. |
| RAPIDITY | • rapidity n. Speed, swiftness; the condition of being rapid. • rapidity n. (Physics) A measure of velocity relative to the speed of light. • rapidity n. (Physics) A measure of the velocity of a particle in a beam relative to the beam’s axis. |
| RIPTIDES | • riptides n. Plural of riptide. • rip␣tides n. Plural of rip tide. • RIPTIDE n. a tide that opposes other tides. |
| SPIRITED | • spirited v. Simple past tense and past participle of spirit. • spirited adj. Lively, vigorous, animated or courageous. • SPIRIT v. to carry off secretly. |
| TAPIROID | • tapiroid adj. (Zoology) Related to the tapir. • tapiroid n. Any perissodactyl of the superfamily Tapiroidea. • TAPIROID n. any member of the tapir family. |
| TIDERIPS | • tide␣rips n. Plural of tide rip. • TIDERIP n. disturbed sea due to currents. |
| TRIPLIED | • TRIPLY v. (Scots) in Scots law, to reply to a duply. |
| TRIPLOID | • triploid adj. (Genetics) Having three sets of chromosomes. • triploid n. A triploid cell. • triploid n. A triploid organism. |
| TRIPODIC | • tripodic adj. Having three feet or legs. • TRIPODIC adj. relating to a tripod, also TRIPODAL. |
| TRIPUDIA | • tripudia n. Plural of tripudium. • TRIPUDIUM n. (Latin) an ancient Roman religious dance in triple time. |