Defn: The stem of an aftershaft or hypoptilum. [Written also hyporachis.]

HYPOSKELETAL
Hy`po*skel"e*tal, a. Etym: [Pref. hypo- + skeletal.] (Anat.)

Defn: Beneath the endoskeleton; hypaxial; as, the hyposkeletal muscles; — opposed to episkeletal.

HYPOSPADIAS
Hy`po*spa"di*as, n. Etym: [NL., fr. Gr. (Med.)

Defn: A deformity of the penis, in which the urethra opens upon its under surface.

HYPOSTASIS
Hy*pos"ta*sis, n.; pl. Hypostases. Etym: [L., fr. Gr. Hypo-, and
Stand.]

1. That which forms the basis of anything; underlying principle; a concept or mental entity conceived or treated as an existing being or thing.

2. (Theol.)

Defn: Substance; subsistence; essence; person; personality; — used by the early theologians to denote any one of the three subdivisions of the Godhead, the Father, Son, and Holy Spirit.

Note: The Council of Alexandria (a.d. 362) defined hypostasis as synonymous with person. Schaff-Herzog.