ideal solid
— Noun
– English
～ any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent
isotonic solution
— Noun
– English
～ a solution having the same osmotic pressure as blood
isosmotic solution
— Noun
– English
～ a solution having the same osmotic pressure as blood
Italian sonnet
— Noun
– English
～ a sonnet consisting of an octave with the rhyme pattern abbaabba, followed by a sestet with the rhyme pattern cdecde or cdcdcd
ill-sorted
— Adjective
– English
～ not easy to combine harmoniously
instantaneous sound pressure
— Noun
– English
～ the difference between the instantaneous pressure at a point in a sound field and the average pressure at that point
interplanetary space
— Noun
– English
～ the part of outer space within the solar system
intergalactic space
— Noun
– English
～ the space between galaxies; "the Milky Way travels through intergalactic space"
in spades
— Adverb
– English
～ without question and beyond doubt; "it was decidedly too expensive"; "she told him off in spades"; "by all odds they should win"
Iceland spar
— Noun
– English
～ a transparent calcite found in Iceland and used in polarizing microscopes
intercom speaker
— Noun
– English
～ the loudspeaker on an intercom or public address system
Icelandic-speaking
— Adjective
– English
～ able to communicate in Icelandic
italian-speaking
— Adjective
– English
～ able to communicate in Italian
infrared spectrum
— Noun
– English
～ the spectrum of infrared radiation
Ixodes spinipalpis
— Noun
– English
～ usually does not bite humans; transmits Lyme disease spirochete to cottontail rabbits and wood rats
inflationary spiral
— Noun
– English
～ an episode of inflation in which prices and wages increase at an increasing rate and currency rapidly loses value
in good spirits
— Adverb
– English
～ without losing equilibrium; "she took all his criticism in stride"
in low spirits
— Adverb
– English
～ in a dejected manner; "when she came back Sophie and Esther were sitting dejectedly in the kitchen"