ambrosia n. [Gr. ambrotos, immortal] (ARTHRO: Insecta) Fungi cultures cultivated by scolytid beetles to feed their larvae; sometimes used to designate that part of the fungus that grows out into the burrows and is eaten by the beetles. see bee-bread, fungus garden.
ambulacral areas (ECHINOD: Asteroidea) The radially arranged arms (typically 5) bearing the tube feet or podia. see interambulacral areas.
ambulacral groove (ECHINOD: Asteroidea) A groove or furrow bordered by large spines extending along the oral surface of each arm of sea stars, that contain two to four rows of small tubular projections called feet or podia.
ambulacral ridge (ECHINOD: Asteroidea) The internal ridge of the external ambulacral groove.
ambulacriform a. [L. ambulare, to walk; forma, shape] Resembling or having the form of an ambulacrum.
ambulacrum n.; pl. -lacra [L. ambulare, to walk] 1. (ARTHRO: Chelicerata) The adhesive disc of hooks that terminate the tarsus of ticks. 2. (ARTHRO: Insecta) The walking leg. 3. (ECHINOD) Plates with pores forming the test, arranged in 5 or more rows, where the podia of the water-vascular system project to the exterior.
ambulate v.i. [L. ambulare, to walk] To walk or move about.
ambulatory a. [L. ambulare, to walk] Having the power of walking or moving from place to place.
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